ANSI/NFRC 200-2023[E0A0]

Procedure for Determining

Fenestration Product Solar Heat Gain
Coefficient and Visible Transmittance
at Normal Incidence

An American National Standard

© 2013, 2023 National Fenestration

Rating Council, Inc.

Prepared by:
National Fenestration Rating Council
6305 Ivy Lane, Suite 410
Greenbelt, MD 20770
P: 301-589-1776
F: 301-589-3884
E: info@nfrc.org
W: www.nfrc.org
 FOREWORD
The National Fenestration Rating Council, Incorporated (NFRC) has developed and
operates a uniform rating system for energy and energy-related performance of
fenestration products. The Rating System determines the U-factor, Solar Heat Gain
Coefficient (SHGC) and Visible Transmittance (VT) of a product, which are mandatory
ratings for labeling NFRC certified products, are mandatory ratings for inclusion on label
certificates, and are supplemented by procedures for voluntary ratings of products for Air
Leakage (AL), and Condensation Resistance. Together, these rating procedures, as set
forth in documents published by NFRC, are known as the NFRC Rating System.
The NFRC Rating System employs computer simulation and physical testing by NFRC-
accredited laboratories to establish energy and related performance ratings for
fenestration product types. The NFRC Rating System is reinforced by a certification
program under which NFRC-licensed responsible parties claiming NFRC product
certification shall label and certify fenestration products to indicate those energy and
related performance ratings, provided the ratings are authorized for certification by an
NFRC-licensed certification and Inspection Agency (IA).
The requirements of the rating, certification, and labeling program (Certification Program)
are set forth in the most recent versions of the following as amended, updated, or
interpreted from time to time:
• NFRC 700 Product Certification Program (PCP).
• NFRC 705 Component Modeling Approach (CMA), Product Certification Program
(CMA-PCP).
Through the Certification Program and the most recent versions of its companion
programs as amended, updated, or interpreted from time to time:
• The laboratory accreditation program (Accreditation Program), as set forth in the
NFRC 701 Laboratory Accreditation Program (LAP).
• The IA licensing program (IA Program), as set forth in NFRC 702 Certification
Agency Program (CAP).
• The CMA Approved Calculation Entity (ACE) licensing program (ACE Program), as
set forth in the NFRC 708 Calculation Entity Approval Program (CEAP).

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 NFRC intends to ensure the integrity and uniformity of NFRC ratings, certification, and
labeling by ensuring that responsible parties, testing and simulation laboratories, and IAs
adhere to strict NFRC requirements.
In order to participate in the Certification Program, a Manufacturer/Responsible Party
shall rate a product whose energy and energy-related performance characteristics are to
be certified in accordance with mandatory NFRC rating procedures. At present, a
Manufacturer/Responsible Party may elect to rate products for U-factor, SHGC, VT, AL,
Condensation Resistance, or any other procedure adopted by NFRC, and to include
those ratings on the NFRC temporary label affixed to its products, or on the NFRC Label
Certificate. U-factor, SHGC and VT, AL, and Condensation Resistance rating reports
shall be obtained from a laboratory that has been accredited by NFRC in accordance
with the requirements of the NFRC 701.
The rating shall then be reviewed by an IA which has been licensed by NFRC in
accordance with the requirements of the NFRC 702. NFRC-licensed IAs also review
label format and content, conduct in-plant inspections for quality assurance in
accordance with the requirements of the NFRC 702, and issue a product Certification
Authorization Report (CAR), or approve for issuance an NFRC Label Certificate for site-
built or CMA products and attachment products. The IA is also responsible for the
investigation of potential violations (prohibited activities) as set forth in the NFRC 707
Compliance and Monitoring Program (CAMP).
Ratings for products that are labeled with the NFRC Temporary and Permanent Label, or
products that are listed on an NFRC Label Certificate in accordance with NFRC
requirements, are considered to be NFRC-certified. NFRC maintains a Certified Products
Directory (CPD), listing product lines and individual products selected by the
manufacturer/responsible party for which certification authorization has been granted.
NFRC manages the Rating System and regulates the Product Certification Program
(PCP), Laboratory Accreditation Program (LAP) and Certification Agency Program (CAP)
in accordance with the NFRC 700 (PCP), the NFRC 701 (LAP), the NFRC 702 (CAP),
the NFRC 705 (CMA-PCP), and the NFRC 708 (CEAP) procedures, and conducts
compliance activities under all these programs as well as the NFRC 707 (CAMP). NFRC
continues to develop the Rating System and each of the programs.
NFRC owns all rights in and to each of the NFRC 700, NFRC 701, NFRC 702, NFRC
705, NFRC 707, NFRC 708 and each procedure, which is a component of the Rating
System, as well as each of its registration marks, trade names, and other intellectual
property.
The structure of the NFRC program and relationships among participants are shown in
Figure 1, Figure 2, and Figure 3. For additional information on the roles of the IAs and
laboratories and operation of the IA Program and Accreditation Program, see the NFRC
700 (PCP), NFRC 701 (LAP), and NFRC 702 (CAP) respectively.

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 Figure 1

Figure 2

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 Figure 3

Questions on the use of this procedure should be addressed to:

National Fenestration Rating

Council
6305 Ivy Lane, Suite 410
Greenbelt, MD 20770
Voice: (301) 589-1776
Fax: (301) 589-3884
Email: info@nfrc.org
Website: www.nfrc.org

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© 2013, 2023. National Fenestration Rating Council Incorporated (NFRC). All rights reserved.
 DISCLAIMER
NFRC certification is the authorized act of a Manufacturer/Responsible Party in: (a) labeling
a fenestration or related attachment product with an NFRC Permanent Label and NFRC
Temporary Label, or (b) generating a site built or CMA label certificate, either of which
bears one or more energy performance ratings reported by NFRC-accredited simulation
and testing laboratories and authorized for certification by an NFRC-licensed IA. Each of
these participants acts independently to report, authorize certification, and certify the
energy-related ratings of fenestration and related attachment products.
NFRC does not certify a product and certification does not constitute a warranty of NFRC
regarding any characteristic of a fenestration or fenestration-related attachment product.
Certification is not an endorsement of or recommendation for any product or product line or
any attribute of a product or product line. NFRC is not a merchant in the business of selling
fenestration products or fenestration-related products, and therefore cannot warrant
products as to their merchantability or fitness for a particular use.
NFRC THEREFORE DISCLAIMS ANY AND ALL LIABILITY THAT MAY ARISE FROM OR
IN CONNECTION WITH SERVICES PROVIDED BY, DECISIONS MADE BY OR
REPORTS OR CERTIFICATIONS ISSUED OR GRANTED BY ANY NFRC-ACCREDITED
LABORATORY, NFRC-LICENSED IA OR ANY PRODUCT MANUFACTURER/
RESPONSIBLE PARTY; RELIANCE ON ANY NFRC PRODUCT DESCRIPTION,
SPECIFICATION, RATING, TEST OR CERTIFICATION, WHETHER APPEARING IN A
REPORT, A PRODUCT CERTIFICATION AUTHORIZATION OR A PRINTED OR
ELECTRONIC DIRECTORY, OR ON A LABEL, OR ON A LABEL CERTIFICATE; OR THE
SALE OR USE OF ANY NFRC-RATED OR CERTIFIED PRODUCT OR PRODUCT LINE;
INCLUDING BUT NOT LIMITED TO DAMAGES FOR PERSONAL OR OTHER INJURY,
LOST PROFITS, LOST SAVINGS OR OTHER CONSEQUENTIAL OR INCIDENTAL
DAMAGES.
NFRC program participants are required to indemnify NFRC from and against such liability.

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© 2013, 2023. National Fenestration Rating Council Incorporated (NFRC). All rights reserved.
This standard is maintained by the Continuous Maintenance Process.
Approval of ANSI / NFRC 200 as an American National Standard is
maintained using the continuous maintenance process. Comments or
proposals for revisions on any part of this standard may be submitted to
National Fenestration Rating Council at any time. Written comments or
proposals must be in writing and be submitted to the NFRC Accredited
Standards Developer at standards@nfrc.org.
Any written comments or proposals submitted to NFRC as provided above
shall be submitted by NFRC to its consensus body for consideration within a
reasonable timeframe not to exceed one year. The submitter will be notified
by NFRC of the expected time frame for consideration of the proposal or
comments. NFRC shall apply for reaffirmation of this standard regardless any
comment or proposals every three years.

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 Table of Contents
Foreword ................................................................................................................... i
Disclaimer ................................................................................................................. v
Table of Contents................................................................................................... vii
1. Purpose .......................................................................................................... 1
2. Scope ............................................................................................................. 1
2.1 PRODUCTS AND EFFECTS COVERED ......................................................... 1
2.1.1 Products Covered Using NFRC 201 Test Procedure for SHGC 2
2.1.2 Products Covered Using NFRC 202 Test Procedure for VT ...... 3
2.1.3 Products Covered Using NFRC 203 Test Procedure for VT ...... 3
2.2 PRODUCTS AND EFFECTS NOT COVERED ................................................. 4
2.2.1 Products and Effects Not Covered (SHGC) ............................... 4
2.2.2 Products and Effects Not Covered (VT) ..................................... 4
3. Definitions...................................................................................................... 5
4. General ........................................................................................................... 8
4.1 COMPLIANCE .......................................................................................... 8
4.1.1 Product Line Simulation and Testing ......................................... 8
4.1.2 Testing Alternative ..................................................................... 9
4.2 PRODUCT LINES AND INDIVIDUAL PRODUCTS ............................................. 9
4.2.1 Product Lines ............................................................................. 9
4.2.2 Individual Products .................................................................... 9
4.2.3 Grouping of Products ................................................................. 9
4.2.4 Additions to Product Lines ....................................................... 12
4.3 STANDARD CONDITIONS ........................................................................ 12
4.3.1 Simulation ................................................................................ 12
4.3.2 Testing ................................................................................... 12
4.3.2.1 SHGC Testing ............................................................ 12
4.3.2.2 VT Testing .................................................................. 13
4.4 MODEL SIZES AND CONFIGURATIONS ..................................................... 14
4.5 SIMULATION PROCEDURES .................................................................... 14

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 Table 4-1 Representative Glazing Pane Thicknesses ........................ 16
4.5.1 Component .............................................................................. 16
4.5.1.1 Approved Center-of-Glazing Simulation Program ...... 16
4.5.1.2 Approved 2-D Heat Transfer Simulation Program ...... 16
4.6 TEST PROCEDURES .............................................................................. 16
4.6.1 Total Fenestration Product....................................................... 17
4.6.2 Component .............................................................................. 17
4.7 TOTAL FENESTRATION PRODUCT RATING ............................................... 17
5. Variation from the General Requirements ................................................ 23
5.1 WINDOW AND SLIDING GLASS DOORS .................................................... 23
5.1.1 Determining Specialty Products Tables for Sightline Variations ..
................................................................................... 23
5.2 SIDE-HINGED EXTERIOR DOORS ............................................................ 23
5.2.1 Calculation of Total Product Rating ......................................... 23
5.2.1.1 Simplification .............................................................. 24
5.2.2 Simplified Door Rating (SDR) Method ..................................... 24
5.2.2.1 Determining SHGC0 and SHGC1 ................................ 24
5.2.2.2 Determining Whole Product SHGC ............................ 25
5.2.2.3 Determining VT0 and VT1 ........................................... 26
5.2.2.4 Determining Whole Product VT .................................. 27
5.2.3 Determining Table of SHGC and VT 0 and 1 Values for
Grouped Sightlines (See 5.1.1)................................................ 27
5.3 SKYLIGHTS ........................................................................................... 27
5.3.1 Determining Table of SHGC and VT 0 and 1 Values for
Grouped Sightlines (See 5.1.1)................................................ 27
5.4 TUBULAR DAYLIGHTING DEVICES ........................................................... 27
5.5 GARAGE (VEHICULAR ACCESS) DOORS .................................................. 27
5.5.1 Scope ................................................................................... 27
5.5.2 Variations from Standard Product Lines .................................. 28
5.5.3 Variations from Standard Individual Products .......................... 28
5.5.4 Variations from Standard Simulation and Test Conditions ....... 28
5.5.5 Total Product Rating ................................................................ 28
5.6 SITE BUILT ........................................................................................... 30
5.7 APPLIED FILMS ..................................................................................... 30
5.7.1 Scope ................................................................................... 30
5.7.2 Variations from Standard Product Lines .................................. 30
5.7.3 Variations from Standard Individual Products .......................... 30
5.7.4 Variations from Standard Simulation and Test Conditions ....... 30
5.7.4.1 Approved Center-of-Glazing Computational Program 31
Table 5-1 Center-of-Glazing Values -- SHGCc and VTc...................... 31
5.7.5 Calculation of Total Product Rating ......................................... 32
Table 5-2 Values of SHGC0 and SHGC1 and VT0 and VT1 for
Reference Products ................................................................. 32
5.7.5.1 Reference Fenestration Products ............................... 32
Table 5-3 Values of SHGC and VT for Reference Fenestration
Products and Applied Film ....................................................... 33

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 5.7.5.2 Total Fenestration Product SHGC .............................. 33
5.7.5.3 Total Fenestration Product VT.................................... 34
5.7.6 Testing ................................................................................... 34
5.7.6.1 Center-of-Glazing Component Test Procedure .......... 34
5.7.6.2 Total Fenestration Product Test Procedure ................ 34
5.7.6.3 Total Fenestration Product SHGC for Non-Model Sizes
................................................................................... 35
5.7.7 Figures ................................................................................... 35
Figure 5-1 Residential Fixed Aluminum Frame Reference Product .... 35
Figure 5-2 Non-residential Windowwall Aluminum Frame Reference
Product .................................................................................... 36
Figure 5-3 Cross Section A ................................................................ 36
Figure 5-4 Cross Section B ................................................................ 37
5.8 DYNAMIC ATTACHMENT PRODUCTS FOR SWINGING DOORS ...................... 37
5.8.1 Scope ................................................................................... 37
5.8.2 Methodology ............................................................................ 37
5.8.3 Approved Computational Program ........................................... 37
5.9 COMPONENT MODELING APPROACH (CMA) FOR NON-RESIDENTIAL
BUILDING FENESTRATION PRODUCTS ..................................................... 38
5.9.1 Scope ................................................................................... 38
5.9.2 Variations from Standard Product Lines .................................. 38
5.9.3 Variations from Standard Individual Products .......................... 39
5.9.4 Variations from Standard Simulation and Test Conditions ....... 39
5.9.5 Calculation of Total Product Rating ......................................... 40
5.9.5.1 Component Modeling Procedure ................................ 40
5.9.5.2 Basic Product Line Model and Component Information
for Calculating and Reporting SHGC and VT ............. 40
5.9.5.3 Definition of Low and High Configurations ................. 40
5.9.5.4 Approved Total Fenestration Product SHGC Calculation
Procedure ................................................................... 41
5.9.5.5 Determining SHGC and VT for Sloped Glazing Systems
................................................................................... 41
5.9.5.6 Approved Total Fenestration Product SHGC and VT for
Non-Model Sizes ........................................................ 41
6. References ................................................................................................... 42
Appendix A (Non-Mandatory Information) ............................................... 44
Index ...................................................................................................................... 45

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1. PURPOSE
To specify a method for calculating solar heat gain coefficient (SHGC) and visible
transmittance (VT) at normal (perpendicular) incidence for fenestration products
containing glazings or glazing with applied films, with specular optical properties
calculated in accordance with ISO 15099 [8] (except where noted) or tested in
accordance with NFRC 201 [2], ANSI/NFRC 202 [3], and ANSI/NFRC 203 [4].
Note: This standard specifies a method for calculating the solar heat gain and
visible transmittance from direct solar radiation through most fenestration
products at normal incidence only. This procedure is limited to normal incidence
calculations because solar optical data needed for such calculations is typically
only available at normal incidence. While solar radiation rarely enters a
fenestration product at normal incidence, SHGC and VT at near normal angles of
incidence (less than 30o off normal) are typically very similar to those at normal
incidence; for other angles, the SHGC and VT at normal can be used, to first
order, as an indicator of the relative magnitude of solar heat gain (SHG) and VT.

2. SCOPE

2.1 Products and Effects Covered

The following products and effects are within the scope of NFRC 200 and
shall be permitted to be rated in accordance with this procedure.
A. Products of all frame materials including (but not limited to)
aluminum, steel, thermally broken aluminum, wood, vinyl,
reinforced vinyl, fiberglass, and plastic, used independently or in
combination;
B. Products of all operator or unit types including (but not limited to)
vertical sliding windows, horizontal sliding windows, casement
windows, projecting windows, fixed windows, non-standard shaped
windows, glazed wall systems, glazings for site-built fenestration
products, bay or bow windows, skylights, and vehicular
(garage/rolling) access doors (with or without glazed areas);
C. Single or multiple assemblies of exterior doors;
D. Products of any size;
E. Products of all glazing materials, tints, and types, including (but not
limited to) clear glass, tinted glass, laminated glass (diffuse or
specular), fritted glazing, etched glazing, sandblasted glazing,
silicone coated glazing, thin plastic films (internally suspended,
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 internally applied, or externally applied, diffuse, or specular), rigid
plastics (diffuse or specular) with or without any solar control,
low-E, or any other partially transparent coating;
F. Products with any or no gap width between glazing layers;
Products with any gas-fill between glazing layers, including (but not
limited to) air, argon, krypton, CO2, or mixes of these gases;
G. Products with any spacer or spacer systems between glazings,
including (but not limited to) metallic, non-metallic, or composite
spacers;
H. Products utilizing any glazing dividers, including (but not limited to)
interior, exterior, or between glazing grilles, muntin bars, caming,
true divided lites, simulated divided lites, or simulated caming bars;
I. Products designed for installation at any tilt;
J. Film attachment products that consist of a flexible adhesive-backed
polymer film which may be applied to the interior or exterior surface
of an existing glazing system in an installed fenestration product
(i.e., as a retrofit, ‘field-installed,’ or ‘daylight-installed’).
Note: Films factory-applied to glazing prior to fenestration
product fabrication and installation are already covered
as glazing options by NFRC 200 and shall not be rated
according to the procedure of Section 5.7
K. Products utilizing shading systems, diffusing systems, or dynamic
glazing that are an integral part of the product as shipped from the
manufacturer;
L. Vacuum insulating glass (VIG); and
M. Dynamic Attachments for Swinging Door.

2.1.1 Products Covered Using NFRC 201 Test Procedure for SHGC
Products not covered by NFRC 200 simulation procedures of
Section 4.5 and that are covered by test-only procedures of Section
4.6 are as follows:
A. Fenestration products with shading systems other than
venetian blinds between the glazing layers of the
fenestration aperture;
B. Products with non-specular transmittance and reflectance
properties, other than those listed in Section 2.1.E, including
(but not limited to) translucent fiberglass and glass blocks;
C. Fenestration systems whose glazing departs from being
parallel, such as with curved glazing, complete bay windows,
corrugated or patterned glazing, or glazing blocks.
(Fenestration systems made up of combinations of complete
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 windows or doors each of which individually meets the
requirements in Section 2.1 can be included by treating each
of the windows or doors separately);
D. Tubular daylighting devices, including hybrid tubular
daylighting devices;
E. Garden or greenhouse windows;
F. Adhesive-backed film products with non-specular
transmittance and reflectance properties, including (but not
limited to) opaque, textured, translucent, or ‘frosted’ films;
G. Adhesive-backed film products with non-uniform properties
across their surface, including (but not limited to) patterned
films; and

2.1.2 Products Covered Using NFRC 202 Test Procedure for VT

Products not covered by NFRC 200 simulation techniques, and
which are covered by test-only procedures are flat, diffusing
products that cannot be measured in a spectrophotometer and
cannot be simulated using computer tools due to complex internal
structure or thickness. Examples of such products include, but are
not limited to:
A. Translucent fiberglass or multicell plastic sandwich panels
with or without internal grids;
B. Translucent multicell profile plastic panels with or without
internal grids;
C. Translucent multicell plastic panels with or without internal
grids;
D. Glass panels with translucent insulation insert material with
or without internal grids between the glass; and
E. Translucent channel reinforcing profile glass with or without
translucent insulation insert material between the glass.

2.1.3 Products Covered Using NFRC 203 Test Procedure for VT

Products not covered by NFRC 200 simulation techniques and that
are covered by test-only procedures are as follows:
• Tubular daylighting devices (TDD).

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 2.2 Products and Effects Not Covered
The following products and effects are beyond the scope of ANSI/NFRC
200 and shall not be rated in accordance with this procedure.

2.2.1 Products and Effects Not Covered (SHGC)

A. Fenestration products with shading or diffusing systems
other than those listed in Section 2.1;
B. Solar heat gain performance changes of a fenestration
product over the course of time, i.e., long-term energy
performance;
C. Fenestration systems, other than those listed in Section 2.1,
with angular selectivity that is with optical properties, though
specular on the small scale which produce emerging rays
whose angle of transmittance is not equal to the angle of
incidence, measured with respect to the normal to the plane
of the fenestration aperture;
D. Adhesive-backed film products with light-redirecting
properties--that is with optical properties which produce one
or more transmitted beams where the direction of the
transmitted beam is not equal to the incident direction,
including (but not limited to) holographic or micro-structured
films; and
E. Adhesive-backed film products incorporating materials with
optical properties that vary in response to ambient conditions
(chromogenic), such as electrochromic, thermochromic, and
photochromic materials.

2.2.2 Products and Effects Not Covered (VT)

A. Fenestration products with shading or diffusing systems,
other than those listed in Section 2.1;
B. Visible transmittance performance changes of a window over
the course of time, i.e., long-term energy performance;
C. Fenestration systems whose glazings depart from being
parallel, such as with curved glass, complete bay windows,
corrugated or patterned glass, glass blocks, etc.
(fenestration systems made up of combinations of complete
windows or doors, each of which individually meet the
requirements in Section 2.1, can be included by treating
each of the windows or doors separately); and

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 D. Fenestration systems, other than those listed in Section 2.1,
with strong angular selectivity, that is, products being
substantially specular in one or more directions while still
being generally diffuse.

3. DEFINITIONS
Definitions and terms are in accordance with definitions in ANSI/NFRC 100;
terms not specified in ANSI/NFRC 100 have been selected to apply to the
fenestration systems.

Fenestration Attachment:
A device (such as, but not limited to, shades, films, or blinds) designed to
be physically attached to, incorporated with, or covering a fenestration
product.

Fenestration Product with Attachment:

The total fenestration product resulting when a fenestration attachment is
combined with (i.e., installed on) a reference fenestration product in the
manner recommended by the manufacturer.

Film:
Fenestration attachment product which consists of a flexible adhesive-
backed polymer film which may be applied to the interior or exterior surface
of an existing glazing system.

Fully CLOSED Position:

The orientation or condition of a Dynamic Glazing Product with a shading
system, or a shade/blind fenestration attachment product, that allows the
minimum Visible Transmittance (VT) within the design limitations of the
product.

Fully OFF Position:

The orientation or condition of a Dynamic Glazing Product, such as
chromogenic glazing, where the glazing is de-energized, de-activated, or
otherwise “OFF.”

Fully ON Position:
The orientation or condition of a Dynamic Glazing Product, such as
chromogenic glazing, where the glazing is energized, activated, or
otherwise “ON.”

Fully OPEN Position:

The orientation or condition of a Dynamic Glazing Product with a shading
system, or a shade/blind fenestration attachment product, that allows the

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 maximum Visible Transmittance (VT) within the design limitations of the
product.

Interlayer:
A layer of material acting as an adhesive between plies of glass which adds
additional performance to the finished product, for example, impact
resistance, solar control, acoustical insulation.

Laminated Glass:
Two or more sheets of glass bonded together with one or more interlayers
of transparent plastic to which the glass adheres if broken, conforming to
ASTM C1172.

Lite:
Another term for glazing used in a fenestration product. Frequently spelled
“lite” in industry literature to avoid confusion with “light,” as in “visible light.”

Obscure Glazing:
Glazing layer that fully or partially obscures or distorts the image through
the layer. Including but not limited to acid-etched, imaged, fritted, silicone
coated, embossed, patterned, textured, wired, and stained glass. Also
included are products with privacy applied films and light-scattering
interlayers.

Reference Fenestration Product:

The fenestration product that an attachment is combined with for the
purposes of rating. A reference fenestration product comprises a reference
glazing system and a reference frame with a specified construction.

Reference Glazing System:

The glazing system in the reference fenestration product.

Reference Frame:
The frame of the reference fenestration product. This may or may not
correspond to an actual frame type available commercially. The reference
frames used for this procedure are shown in Section 5.7.

Solar Heat Gain Coefficient (SHGC):

The ratio of the solar heat gain entering the space through the fenestration
product to the incident solar radiation. Solar heat gain includes directly
transmitted solar heat and that portion of the absorbed solar radiation which
is then reradiated, conducted, or convected into the space.

Frame Solar Heat Gain Coefficient (SHGCf):

The solar heat gain through all frame and sash members divided by the
total incident solar radiation and the frame area, as defined in ANSI/NFRC
100.

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 Divider Solar Heat Gain Coefficient (SHGCd):
The SHGC representative of the divider area, as defined in ANSI/NFRC
100.

Edge-of-glazing Solar Heat Gain Coefficient (SHGCe):

The SHGC representative of the edge of glazing area, as defined in
ANSI/NFRC 100.

Edge-of-divider Solar Heat Gain Coefficient (SHGCde):

The SHGC representative of the edge-of-divider area, as defined in
ANSI/NFRC 100.

Center-of-glazing Solar Heat Gain Coefficient (SHGCc)

The SHGC representative of the center of glazing area, as defined in
ANSI/NFRC 100.

Total Fenestration Product Solar Heat Gain Coefficient (SHGCt):

The SHGC representative of the total fenestration product, as defined in
Equation 4-3 of Section 4.7.
SHGC0: The total fenestration product SHGC for a center-of-glazing SHGC
of 0.0.
SHGC1: The total fenestration product SHGC for a center-of-glazing SHGC
of 1.0.

Frame Absorptance:
The fraction of solar radiation absorbed by the exterior frame surface.

Frame Color:
The color of the exterior frame surface exposed to solar radiation (see
frame absorptance).

Visible Transmittance (VT):

The ratio of visible radiation entering the space through the fenestration
product to the incident visible radiation, determined as the spectral
transmittance of the total fenestration system, weighted by the photopic
response of the eye and integrated into a single dimensionless value.
Weighted by a standard solar spectrum.

Frame Visible Transmittance (VTf):

The visible light through all frame and sash members divided by the total
incident visible light and the frame area (as defined in ANSI/NFRC 100).

Divider Visible Transmittance (VTd):

The VT representative of the divider area, as defined in ANSI/NFRC 100

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 Edge-of-Glazing Visible Transmittance (VTe):
The VT representative of the edge of glazing area, as defined in Section 4.6
of ANSI/NFRC 100; the value equals the center-of-glazing VT.

Edge-of-Divider Visible Transmittance (VTde):

The VT representative of the edge-of-divider area, as defined in
ANSI/NFRC 100; the value equals the center-of-glazing VT.

Center-of-Glazing Visible Transmittance (VTc):

The VT representative of the center of glazing area, as defined in
ANSI/NFRC 100.

Total Fenestration Product Visible Transmittance (VTt):

The VT representative of the total fenestration product, as defined in
Equation 4-4 of Section 4.7.
VTo: The total fenestration product VT for a center-of-glazing VT of 0.0.
VT1: The total fenestration product VT for a center-of-glazing VT of 1.0.

4. GENERAL

4.1 Compliance
Fenestration product ratings shall be determined following the procedure
outlined in Section 4.1, in accordance with the criteria specified in
Sections 4.2 through 4.7, as modified by applicable portions of Section 5.
This section presents and references methods for determining specific
fenestration product heat transfer properties or quantities used in the
determination of these properties.
This procedure shall use the Trendline approach as indicated in Section
5.11 of ANSI/NFRC 100.

4.1.1 Product Line Simulation and Testing

The total fenestration product SHGC and VT shall be evaluated in
the position specified in ANSI/NFRC 100 and in accordance with
ISO 15099, using the fenestration product sizes as given in Table
4-3 of ANSI/NFRC 100. Fenestration products shall be evaluated
without screens or removable grilles. The items listed below are
exceptions to ISO 15099 that are to be implemented in NFRC-
approved software/algorithms:
A. Include models for venetian blind slats (See References 14
and 15):

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 B. Thermal radiation from venetian blinds shall be calculated
using directional diffuse radiation (See References 14 and
15);
C. Include models for fritted, etched, or sandblasted glazing
(See References 15 and 16); and
D. Diffuse solar radiation propagation through the glazing
system shall be calculated using matrix methodology (See
References 15, 17 and 18).
E. For opaque spandrel panel systems, the center-of-glass
SHGC shall be determined using Berkeley Lab WINDOW.
(See Reference 6)
F. Include models for vacuum insulating glass (VIG) (See
Reference 19 and 20)

4.1.2 Testing Alternative

The component or total fenestration product SHGC shall be tested
in accordance with NFRC 201.
For translucent panels, center-of-glazing VT shall be tested in
accordance with NFRC 202.
For TDD products, the VT shall be tested in accordance with NFRC
203.
For products not covered under NFRC 202 or NFRC 203, the
component or fenestration product VT shall be tested once a test
procedure has been approved.

4.2 Product Lines and Individual Products

4.2.1 Product Lines

Refer to Section 4.2.1 of ANSI/NFRC 100 for the definition of a
product line.

4.2.2 Individual Products

Refer to Section 4.2.2 of ANSI/NFRC 100 for the definition of an
individual product. For the purposes of this procedure only,
variations in gap width, frame or sash color, and/or gas-fill do not
constitute different individual products.

4.2.3 Grouping of Products

A. Identify product groupings within a product line with respect
to frame differences from the existing U-factor matrix. To
determine representative frame U-factors for a group from
the existing U-factor matrix, use the frame option with the

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 highest frame and edge U-factor for the lowest center-of-
glazing U-factor in the matrix. Should the lowest center-of-
glazing option be included in a center-of-glazing grouping
per ANSI/NFRC 100, the group leader option shall be used.
The frame SHGC is determined using this frame U-factor
(refer to Section 4.7) and applies to all glazing options in the
product grouping, regardless of the number of glazing layers,
gap thicknesses, gas fills, and spacer type;
B. Assume a default divider U-factor of 2.27 W/m2·ºC (0.40
Btu/h·ft2·ºF) for all dividers, regardless of type of divider or
size, including caming. The divider SHGC is determined
using this divider U-factor (refer to Section 4.7) and applies
to all glazing options in the product grouping, regardless of
the number of glazing layers, gap thicknesses, gas fills, and
spacer types; and
C. When rating dynamic glazing products with shading systems
between glazing layers, it shall be permitted to group
combinations of shading systems and glazing layers. For
purposes of determining SHGC, the shading system and
glazing layers comprising each group leader shall be
determined using one of the following methods:
i. Shading systems within a group shall vary only by
color of the shading systems. The shading system
used in the group leader shall be of the darkest color
within the group. The darkest color shall be defined as
that color with the lowest L* value in the CIE L*a*b*
color space, as described in Section 8 of CIE 15.
If multiple shading systems within the group have the
same, lowest L* value, then any one of those shading
systems shall be permitted to be used in the group
leader.
Glazing layers within a group, and the corresponding
glazing layers used in the group leader, shall be
determined in accordance with the representative
glazing pane thicknesses rules of Table 4-1.
ii. If a shading manufacturer chooses to group products
based on color, the products shall be modeled using
default reflectance values (Rsol and Rvis) of 0.050, an
emissivity value of 0.9, and a transmittance value (Tir)
of 0.00.
NOTE: If grouping by material, refer to Section 4.2.4.2
in ANSI/NFRC 100 for material properties.

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 D. When rating dual skin translucent panels, with either air or
an insulation infill between panels, it shall be permitted to
group different thicknesses of panel skins. The grouping of
panel thickness shall be in accordance with Table 4-1.
Different tints of the panel skins and different infills are not
allowed to be grouped and will be different individual
products within the same product line.
Note: It is intended that these same rules shall apply to
determining VT ratings as well, when procedures for
obtaining VT ratings for such products are approved and
implemented.
E. Sightline groups shall consist only of individual products with
sightline differences due to frame/sash base profile
variations. These products shall be permitted to be grouped
with each group represented by the sightline group leader.
The group leader shall be the sightline option within the
group such that all individual sightline frame/sash variations
within the group have an SHGC of ± 0.025 of that group
leader when calculated using the glazing option with the
highest center-of-glass SHGC or a center-of-glass SHGC
equal to 0.71. If this approach is used, all sightline
frame/sash variations within the group shall be assigned the
same total fenestration product SHGC and VT as the
sightline group leader. This procedure is only valid for
glazing options with center-of-glass SHGCs lower than or
equal to the option chosen to calculate the group leader.
i. Upon compliance of the conditions in Section
4.2.3.E.i, it is acceptable to create multiple group
leaders to accommodate multiple steps in
performance. The SHGC and VT Specialty Products
Table of the sightline group leaders shall be
determined in one of the following ways:
(a) Model each product variation and determine
the Specialty Products Table (SHGC0, SHGC1,
VT0, and VT1) using the best U-factor glass
option; or
(b) Use the method outlined in Section 5.1.1.

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 4.2.4 Additions to Product Lines

When adding new options to an existing glass matrix, the original

Specialty Products Table (SHGC0, SHGC1, VT0, and VT1) shall be
used for the entire certification cycle.

4.3 Standard Conditions

This section presents procedures for determining total or component
fenestration product SHGC and VT. For rating SHGC and VT of individual
products at model sizes, follow Section 4.4.

4.3.1 Simulation
Approved solar optical data shall be used with the approved center-
of-glazing software. NFRC approved solar optical data is listed in
Reference 4. Exception to this is the modeling of an opaque
spandrel panel system which shall create metal and insulation
materials in the Glass Library for thickness, Tsol, Rsol1, Tvis,
Rvis1, Rvis2, Tir, emissivity (front and back), and conductivity (See
Reference 6 for simulation setup in Berkeley Lab WINDOW).
The center-of-glazing SHGC (SHGCc) shall be determined using
the following conditions:
Tin = 24ºC (75ºF)
Tout = 32ºC (90ºF)
V = 2.75 m/s (6.15 mph)
Trm,out = Tout
Trm,in = Tin
Is = 783 W/m2 (248 Btu/h·ft2)

4.3.2 Testing
Specified testing conditions in this section shall be used to
determine the SHGC and VT of the individual fenestration products.
See Section 4.6.1 for both the center-of-glazing and the total
fenestration product.

4.3.2.1 SHGC Testing

A. Environmental Conditions during NFRC 201
Testing
i. Average nominal inside air temperature
shall be 24º C (75º F);
ii. Inside surface coefficient (as measured on
a vertical CTS per Section 5.5.1 of NFRC
201) shall be 7.7 W/m2K ± 5% (1.4
Btu/h•ft2•ºF ± 5%);

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 iii. The solar irradiance shall never be less
than 680 W/m2 (200 Btu/h•ft2);
iv. The incident angle of the direct solar
irradiance shall be maintained at less than
or equal to 5° from normal to the plane of
the solar calorimeter aperture (i.e.,
perpendicular to the outside surface of the
surround panel); and
v. The aperture of the solar calorimeter (i.e.,
the plane of the outside surface of the
surround panel) shall not be tilted more
than 60° from vertical unless the laboratory
can demonstrate that their calorimeter can
meet the inside surface coefficient
tolerance specified (Section 4.3.3.B) at the
greater tilt angle.
B. Center-of-Glazing Component Test Procedure
i. The center-of-glazing SHGC shall be
calculated in accordance with NFRC 201,
applying environmental conditions specified
in Section 4.3.2.1.A of this document;
ii. For a product that consists of a glazing
panel only (without frame), the tested
SHGC per NFRC 201 shall be the SHGC of
the product.

4.3.2.2 VT Testing
A. Environmental Conditions during TDD Testing
(See ANSI/NFRC 203).
B. Center-of-Glazing Component Test Procedure
i. The center-of-glazing VT shall be
calculated in accordance with ANSI/NFRC
202;
ii. For a product that consists of a glazing
panel only (without frame), the tested VT
per ANSI/NFRC 202 shall be the VT of the
product.

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 4.4 Model Sizes and Configurations
Total fenestration product SHGC and VT shall be determined for the
model size shown in Table 4-3 of ANSI/NFRC 100.

4.5 Simulation Procedures

This section presents the method for determining individual product SHGC
and VT for model sizes.
Determine the total fenestration product SHGC and VT values for center-
of-glazing SHGC and VT values of 0.0 and 1.0 (per Section 4.7) for all
applicable cases: no dividers, dividers less than 25.4 mm (1.00 in) wide,
and greater than or equal to 25.4 mm (1.00 in) wide.
A. Nominal glass thickness may be used for determining the SHGCc
and VTc of the glazing system;
B. For product groupings within a product line identified in Section
4.2.3.A with respect to frame differences, the group leader shall be
used to determine the SHGC and VT of 0 and 1. The frame SHGC
is determined using this frame U-factor (refer to Section 4.7) and
applies to all glazing options in the product grouping;
C. For divider groupings, identified in Section 4.2.3.B, the divider
SHGC is determined using this divider U-factor (refer to Section
4.7) and applies to all glazing options in the product grouping.
Separate dividers into two categories: those less than 25.4 mm
(1.00 in) wide and those greater than or equal to 25.4 mm (1.00 in)
wide. Dividers greater than or equal to 25.4 mm (1.00 in) are
modeled at 38.1 mm (1.50 in) and dividers less than 25.4 mm (1.00
in) are modeled at 19.05 mm (0.75 in). Products with dividers in
only a portion of the product are assumed to have dividers in the
entire product. The overall window dimension shall be used to
determine the number of horizontal and vertical dividers. For default
divider patterns, refer to ANSI/NFRC 100;
Tapes that are transparent or translucent shall be deemed to be
equivalent to the same glass without the tape;
D. Frame and divider SHGC shall be calculated with a default frame
and divider absorptance of 0.3 for all products except glazed wall
systems and sloped glazing systems (as defined in Table 4-3 of
ANSI/NFRC 100 and Section 5.6 in ANSI/NFRC 100). For glazed
wall systems and sloped glazing systems, use a default frame and
divider absorptance of 0.5;

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 E. If using WINDOW to simulate each product group identified in
Section 4.2.3 for U-factor, the frame representative SHGC0,
SHGC1, VT0, and VT1 for no dividers, dividers less than 25.4 mm
(1.00 in) wide, and dividers greater than or equal to 25.4 mm (1.00
in) wide used in Equations 4-1 and 4-2 shall be obtained from the
group leader with no dividers;
F. For products that cannot use WINDOW, to obtain the frame
representative SHGC0, SHGC1, VT0, and VT1 for no dividers,
dividers less than 25.4 mm (1.00 in) wide, and dividers greater than
or equal to 25.4 mm (1.00 in) wide, then the method in Section
4.7.B shall be used as appropriate;
G. A matrix of center-of-glazing SHGC and VT glazing options specific
to the product line shall be created for use in Equation 4-1 and
Equation 4-2. This center-of-glazing matrix may include variations
in number of glazing layers, glazing types (tints, laminated glass,
etc.), and glazing coatings.
For each product line, products may be rated using either:
i. The actual glazing infill assembly's pane thickness for
determining SHGC and VT, or
ii. Applicable representative glazing infill pane thicknesses (in
Table 4-1) for the range of glazing infill pane thicknesses for
that product line. Table 4-1 is not applicable for laminated
glass; the actual glass and interlayer assembly shall be
used.
Laminates not found in the NFRC IGDB may be built in Optics, per
NFRC 303, but the glass layers shall be NFRC # sign approved,
and the interlayer found in the approved interlayer list provided by
LBNL.
Ratings for products with obscure glass shall be permitted to be
assumed to be equivalent to the ratings for clear glass. This option
can be used as an alternative to obtain product properties using the
measurement procedure defined in NFRC 300 and 301 for diffuse
products.
Glazing layers that are partially covered with a light-scattering
element shall be simulated using the properties of the fully covered
layer and properties of the non-scattering layer, and the final result
is the area-weighted mix of the different areas and:

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 Table 4-1 Representative Glazing Pane Thicknesses
Range of Glazing Infill Pane Thicknesses
Used in Product Line Represented by Size
mm (in) mm (in)
x < 2.0 (x < 5/64) Actual
2.0 < x < 4.5 (5/64 < x < 11/64) 3.0 (1/8)
4.5 < x < 7.1 (11/64 < x < 9/32) 6.0 (1/4)
7.1 < x (9/32 < x) Actual

H. Products that meet the definition of a Dynamic Glazing Product

shall be rated at their Fully ON/CLOSED and Fully OFF/OPEN
Positions. The manufacturer shall specify the appropriate
procedure to use to achieve the stated positions. Rating procedures
for the stated positions shall be the same as for non-Dynamic
Glazing Products, as outlined in this section or Section 4.6 as
appropriate.
When rating Dynamic Glazing Products with slatted blinds between
glass in the Fully OFF/OPEN position, the standardized slat stack
heights of Table 4-2 of ANSI/NFRC 100 shall be used.
I. Product lines using the Trendline approach per Section 5.11 of
ANSI/NFRC 100 shall use lowest center-of-glass endpoint to
calculate the SHGC0, SHGC1, VT0, and VT1 for each Trendline.

4.5.1 Component

4.5.1.1 Approved Center-of-Glazing Simulation Program

Approved center-of-glazing software shall be used to
determine SHGCc and VTc. NFRC-approved software is
listed in Reference 4.

4.5.1.2 Approved 2-D Heat Transfer Simulation Program

Approved 2-D heat-transfer software shall be used.
NFRC approved software is listed in Reference 4.
Determination of frame U-factors for calculating frame
SHGC shall comply with the conditions of ANSI/NFRC
100.

4.6 Test Procedures

If a product listed in Section 2.1 cannot be simulated in accordance with
Section 4.5, the test procedures in this section shall be used to determine
the SHGC and VT of the individual fenestration product: Section 4.6.2 for
the center-of-glazing and Section 4.6.1 for the total fenestration product.
However, these test procedures shall only be used for the reporting of
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 SHGC and VT if the size conditions in Section 4.4 of ANSI/NFRC 100 are
met. The only time a product line shall contain tested total fenestration
product SHGC and/or VT is when an accredited simulation laboratory
states in writing that it cannot simulate an individual product (s) to a
reasonable accuracy by either using the computational procedure or by
using a combination of computational and center-of glazing component
test procedures. In addition, the written permission of NFRC is required for
products not specifically addressed in this document.
Currently complex glazed products other than the following cannot be
simulated:
A. Products with between-glass venetian blinds,
B. Products with outdoor woven shades,
C. Products with indoor woven shades,
D. Products with indoor venetian blinds, and
E. Products with fritted glazing.

4.6.1 Total Fenestration Product

A. The total fenestration product SHGC shall be calculated in
accordance with NFRC 201 at the conditions specified in
Section 4.3.2.1.A.
B. For TDD products, determination of the whole product VT is
per ANSI/NFRC 203.
Guidance for the appropriate use of any future approved Total
Fenestration Product Test Procedure for VT will be published as an
addendum to this procedure or as a Technical Interpretation.

4.6.2 Component
A. The center-of-glazing SHGC shall be measured in
accordance with NFRC 201.
B. The center-of-glazing VT shall be measured in accordance
with ANSI/NFRC 202.

4.7 Total Fenestration Product Rating

The total fenestration product SHGC and VT shall be calculated as
outlined below:
A. For fenestration products that will be using WINDOW and THERM
for the total product calculations, determine all of the following, as
applicable:
i. Center-of-glazing SHGC and VT using the approved center-
of-glazing computational program;

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 ii. Edge-of-glazing SHGC and VT. This value shall be equal to
the center-of-glazing SHGC and VT values, respectively;
iii. Obtain the frame representative SHGC0, SHGC1, VT0, and
VT1 from WINDOW for no dividers, dividers less than
25.4 mm (1.00 in) wide, and dividers greater than or equal to
25.4 mm (1.00 in) wide, per Section 4.5.C of this document;
iv. Divider edge-of-glazing SHGC and VT. This value shall be
equal to the center-of-glazing SHGC and VT values,
respectively;
v. For any SHGCc, the total fenestration product SHGC can be
calculated using the following equation:

𝑆𝐻𝐺𝐶 = 𝑆𝐻𝐺𝐶0 + 𝑆𝐻𝐺𝐶𝑐 (𝑆𝐻𝐺𝐶1 − 𝑆𝐻𝐺𝐶0 ) Equation 4-1

Where
SHGC0 = The total fenestration product SHGC for the
center-of glazing SHGC of 0.0
SHGC1 = The total fenestration product SHGC for the
center-of-glazing SHGC of 1.0

Perform the calculations with SHGCc, SHGC0, and SHGC1 values

to six significant figures (0.XXXXXX). Report the final SHGC value
to two significant digits (0.XX);
vi. For any VTc, the total fenestration product VT can be
calculated using the following equation:

𝑉𝑇 = 𝑉𝑇0 + 𝑉𝑇𝑐 (𝑉𝑇1 − 𝑉𝑇0 ) Equation 4-2

Where
VT0 = The total fenestration product VT for the center-
of-glazing VT of 0.0
VT1 = The total fenestration product VT for the center-
of-glazing VT of 1.0
Perform the calculation with VTc, VT0, and VT1 values to six significant
digits (0.XXXXXX). Report the final VT value to two significant digits
(0.XX);
B. For products that cannot use WINDOW to obtain the frame
representative SHGC0, SHGC1, VT0, and VT1 for no dividers,
dividers less than 25.4 mm (1.00 in) wide, and dividers greater than
or equal to 25.4 mm (1.00 in) wide, per Section 4.5.C of this
document, then the following shall be determined, as applicable, to
be able to calculate whole product SHGC/VT values. See
exceptions below for Vehicular Access (Garage) Doors and Side-
Hinged Exterior

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 Exceptions:
Opaque spandrel panel fenestration products do not require VT
ratings and therefore any combined references in the sections
below for VT shall be ignored. For whole product SHGC of
spandrel panel system fenestration products, equation 4-3 shall be
used to area-weight the framing SHGC with the opaque spandrel
SHGCc.
i. Vehicular Access (Garage) Doors do not require VT ratings.
Therefore, any combined references in the sections below
for VT shall be ignored. Additionally, frame representative
SHGC0 and SHGC1 values are not required and therefore a
whole product SHGC rating shall be obtained by following
steps i. through v. below, and then referring to Section 5.5.5;
ii. Side-hinged exterior doors using the Simplified Door Rating
(SDR) method shall use a default glazing in the doorglass
assembly (DGAA) for determining the product line's SHGC0,
SHGC1, VT0, and VT1 values. Therefore, only iii of this
section applies. Refer to Section 5.2.2 for the modified
SHGC0, SHGC1, VT0, and VT1 calculations that shall be
used in Equations 4-1 and 4-2 for whole product SHGC/VT
ratings.
(a) Center-of-glazing SHGC and VT using the approved
center-of-glazing computational program;
(b) Edge-of-glazing SHGC and VT shall be, equal to the
center-of-glazing SHGC and VT values, respectively.
This includes the glass edge for side-hinged exterior
doors and vehicular access (garage) doors.
(c) Frame and divider SHGCs shall be calculated in
accordance with ISO 15099 (Section 4.2.2), and
Equation 4-3 of this document. The frame and divider
SHGCf shall be calculated separately.

𝑈𝑓
𝑆𝐻𝐺𝐶𝑓 = 𝛼 ∙
𝐴𝑠𝑢𝑟𝑓 Equation 4-3
ℎ𝑜𝑢𝑡
𝐴𝑓

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 Where
α = Frame or divider absorptance
Af = Sum of the projected dimensions of the opaque
portion
Asurf = Sum of the wetted areas of the opaque portion
Uf = Area-weighted average winter nighttime U-
factor of the opaque portion
hout = 20.6 W/m2K

The frame and divider U-factors shall be determined with

the 2-D heat transfer computational program at the
environmental conditions specified in ANSI/NFRC 100,
except as noted in Section 4.5 of this document,
(i) Opaque frame and divider VT are equal to 0.0,
(ii) Divider edge-of-glazing SHGC and VT, equal
to the center-of-glazing SHGC and VT values
respectively,
(iii) The component areas:
(1) Center-of-glazing area,
(2) Divider area,
(3) Edge-of-glazing area,
(4) Edge-of-divider area,
(5) Frame area,
(6) Edge-of-Lite area,
(7) Edge-of-Panel area,
(8) Door-Lite Frame area,
(9) Panel Core area,
(10) Door Core area, and
(11) Projected fenestration product area
(d) Perform the following calculations (as shown in
Equation 4-4) to determine SHGC0 and SHGC1,
where applicable:
(i) Multiply all fenestration component SHGC:
frame, door panel core, door panel edge, door
core, door-lite frame, divider, door-lite frame
edge, the center-of-glazing, edge-of-glazing,
and edge-of-divider by their corresponding
areas. For SHGC0; the SHGCc, SHGCe,

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 SHGCde, and SHGC edge-of-lite shall be equal
to 0. For SHGC1, the SHGCc, SHGCe,
SHGCde, and SHGCle shall be equal to 1.
(ii) Total these quantities and divide this total by
the projected fenestration product area to
produce a table of computed representative
frame fenestration product SHGCs at a center-
of-glazing value of 0 and 1.
Equation 4-4

[(𝑆𝐻𝐺𝐶𝑥 𝐴𝑥 ) + (𝑆𝐻𝐺𝐶𝑑 𝐴𝑑 ) + (𝑆𝐻𝐺𝐶𝑒 𝐴𝑒 ) + (𝑆𝐻𝐺𝐶𝑑𝑒 𝐴𝑑𝑒 ) + (𝑆𝐻𝐺𝐶𝑙𝑒 𝐴𝑙𝑒 ) + (𝑆𝐻𝐺𝐶𝑐 𝐴𝑐 )]

𝑆𝐻𝐺𝐶0 =
𝐴𝑝𝑓

[(𝑆𝐻𝐺𝐶𝑥 𝐴𝑥 ) + (𝑆𝐻𝐺𝐶𝑑 𝐴𝑑 ) + (𝑆𝐻𝐺𝐶𝑒 𝐴𝑒 ) + (𝑆𝐻𝐺𝐶𝑑𝑒 𝐴𝑑𝑒 ) + (𝑆𝐻𝐺𝐶𝑙𝑒 𝐴𝑙𝑒 ) + (𝑆𝐻𝐺𝐶𝑐 𝐴𝑐 )]

𝑆𝐻𝐺𝐶1 =
𝐴𝑝𝑓
Where
SHGC0 = Representative SHGC of product with a center-of-glazing SHGC = 0
SHGC1 = Representative SHGC of product with a center-of-glazing SHGC = 1
SHGCx = Frame SHGC-values frame, door-lite frame, door core, door panel
core, and door panel edge, as determined by Equation 4-3
Ax = Sum of the frame, door-lite frame, door core, door panel core, and
door panel edge projected areas, m2 (ft2)
SHGCd = Divider SHGC, as determined by Equation 4-3
Ad = Divider area
SHGCe = Edge-of-glazing SHGC, set to zero for SHGC0 and one for SHGC1
Ae = Edge-of-glazing area
SHGCde = Edge-of-divider SHGC, set to zero for SHGC0 and one for SHGC1
Ade = Edge-of-divider area
SHGCle = Door-lite edge SHGC, set to zero for SHGC0 and one for SHGC1
Ale Door-lite edge area
SHGCc = Center-of-glazing SHGC, set to zero for SHGC0 and one for SHGC1
Ac = Center-of-glazing area
Apf = Projected fenestration product area

iii. For any SHGCc, the total fenestration product SHGC can be
calculated using Equation 4-1 of this document.
iv. Perform the following calculations (as shown in Equation 4-
5) to determine VT0 and VT1, where applicable:

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 (a) Multiply all fenestration component VT; frame, door
panel core, door panel edge, door core, door-lite
frame, divider, door-lite frame edge, center-of-glazing,
edge-of-glazing, edge-of-divider, and frame VT by
their corresponding areas. For VT0, the VTc, VTe,
VTde, and VTle shall be zero. For VT1, the VTc, VTe,
VTde, and VTle shall be one.
(b) Total these quantities, and
(c) Divide this total by the projected fenestration product
area to produce a table of computed representative
fenestration product VTs at a center-of-glazing value
of 0 and 1.
Equation 4-5

[(𝑉𝑇𝑥 𝐴𝑥 ) + (𝑉𝑇𝑑 𝐴𝑑 ) + (𝑉𝑇𝑒 𝐴𝑒 ) + (𝑉𝑇𝑑𝑒 𝐴𝑑𝑒 ) + (𝑉𝑇𝑙𝑒 𝐴𝑙𝑒 ) + (𝑉𝑇𝑐 𝐴𝑐 )]

𝑉𝑇0 =
𝐴𝑝𝑓

[(𝑉𝑇𝑥 𝐴𝑥 ) + (𝑉𝑇𝑑 𝐴𝑑 ) + (𝑉𝑇𝑒 𝐴𝑒 ) + (𝑉𝑇𝑑𝑒 𝐴𝑑𝑒 ) + (𝑉𝑇𝑙𝑒 𝐴𝑙𝑒 ) + (𝑉𝑇𝑐 𝐴𝑐 )]

𝑉𝑇1 =
𝐴𝑝𝑓
Where
VT0 = Representative VT of product with a center-of-glazing VT = 0
VT1 = Representative VT of product with a COG SHGC = 0.
VTx = Frame VT-values of frame, door-lite frame, door core, door panel
core, and door panel edge
Ax = Sum of the frame, door-lite frame, door core, door panel core, and
door panel edge projected areas, m2 (ft2)
VTd = Divider VT
Ad = Divider area
VTe = Edge-of-glazing VT, set to zero for VT0 and one for VT1
Ae = Edge-of-glazing area
VTde = Edge-of-divider VT, set to zero for VT0 and one for VT1
Ade = Edge-of-divider area
VTle Door-lite edge VT, set to zero for VT0 and one for VT1
VTle Door-lite edge area
VTc = Center-of-glazing VT, set to zero for VT0 and one for VT1
Ac = Center-of-glazing area
Apf = Projected fenestration product area

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 v. For any VTc, the total fenestration product VT can be
calculated using Equation 4-2 of this document.

5. VARIATION FROM THE GENERAL REQUIREMENTS

5.1 Window and Sliding Glass Doors

5.1.1 Determining Specialty Products Tables for Sightline Variations

A. Determine the Table of SHGC and VT 0 and 1 values for two
configurations:
i. Product with the Greatest Daylight Opening;
SHGC0greatest, SHGC1greatest, VT0greatest, VT1greatest
ii. Product with the Least Daylight Opening;
SHGC0least, SHGC1least, VT0least, VT1least
B. Determine the VT1option for each variation by determining the
Daylight Opening (Vision Area) and dividing by the Total
Area as follows;
VT1option = Daylight Opening Area / Total Area
C. Calculate the SHGC0option for each variation as follows;
SHGC0option = SHGC0greatest + (VT1greatest - VT1option)
(SHGC0least – SHGC0greatest) / (VT1greatest – VT1least)
D. Calculate the SHGC1option for each variation as follows;
SHGC1option = SHGC0option + VT1option

5.2 Side-Hinged Exterior Doors

5.2.1 Calculation of Total Product Rating

When simulating SHGC for continuous single pane decorative lite
(decorative lite includes glass and caming), the decorative lite glass
shall be assumed to have the same properties as clear glass of the
same glass thickness.
When simulating SHGC where a single pane decorative lite
(continuous or non-continuous) is used as the middle layer of a
triple glazed glass unit, the decorative lite glass shall be assumed
to have the same properties as clear glass of the same glass
thickness.

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 5.2.1.1 Simplification
For SHGC simulation, if the minimum distances between
the surrounding glass and the decorative lite (both glass
and caming) are greater than 3 mm (0.118 in), the option
shall be rated with the less than 25.4 mm (1.00 in) divider
option.

5.2.2 Simplified Door Rating (SDR) Method

This method shall refer to Section 4.5.B through 4.5.D to obtain the
DGAA and door slab frame representative SHGC0, SHGC1, VT0,
and VT1 for no dividers, dividers less than 25.4 mm (1.00 in) wide,
and dividers greater than or equal to 25.4 mm (1.00 in) wide.

5.2.2.1 Determining SHGC0 and SHGC1

The opaque door area (that is, the area outside the
DGAA, including door frame and sill) shall be simulated
in five configurations, calculated per Equation 5-1, for the
opaque, ¼ lite, ½ lite, ¾ lite, and full-lite opaque areas;
The SHGC of the DGAA of the door shall be simulated
using 4 configurations, calculated per Equations 5-2 and
5-3, at the ¼ lite, ½ lite, ¾ lite and full-lite sizes (See
Figure 5-10 of ANSI/NFRC 100 for door slab with various
panel sizes);
Equation 5-1:

𝑆𝐻𝐺𝐶𝑠𝑑 𝐴𝑠𝑑 = [(𝑆𝐻𝐺𝐶𝑓 𝐴𝑓 ) + (𝑆𝐻𝐺𝐶𝑑𝑐 𝐴𝑑𝑐 ) + (𝑆𝐻𝐺𝐶𝑝 𝐴𝑝 ) + (𝑆𝐻𝐺𝐶𝑒𝑝 𝐴𝑒𝑝 )]

Equation 5-2: For SHGC0 of DGAA:

𝑆𝐻𝐺𝐶0𝐷𝐺𝐴𝐴 𝐴𝐷𝐺𝐴𝐴 = [(𝑆𝐻𝐺𝐶𝑙𝑓 𝐴𝑙𝑓 ) + (𝑆𝐻𝐺𝐶𝑑 𝐴𝑑 ) + (𝑆𝐻𝐺𝐶𝑑𝑒 𝐴𝑑𝑒 ) + (𝑆𝐻𝐺𝐶𝑒𝑔 𝐴𝑒𝑔 )]

Equation 5-3: For SHGC1 of DGAA:

𝑆𝐻𝐺𝐶1𝐷𝐺𝐴𝐴 𝐴𝐷𝐺𝐴𝐴 = [(𝑆𝐻𝐺𝐶𝑙𝑓 𝐴𝑙𝑓 ) + (𝑆𝐻𝐺𝐶𝑑 𝐴𝑑 ) + (𝑆𝐻𝐺𝐶𝑑𝑒 𝐴𝑑𝑒 ) + (𝑆𝐻𝐺𝐶𝑒𝑔 𝐴𝑒𝑔 ) + (𝐴𝑐 )]
Equation 5-4:

[(𝑆𝐻𝐺𝐶𝑠𝑑 𝐴𝑠𝑑 ) + (𝑆𝐻𝐺𝐶0𝐷𝐺𝐴𝐴 𝐴𝐷𝐺𝐴𝐴 )]

𝑆𝐻𝐺𝐶0 =
𝐴𝑡
Equation 5-5:

[(𝑆𝐻𝐺𝐶𝑠𝑑 𝐴𝑠𝑑 ) + (𝑆𝐻𝐺𝐶1𝐷𝐺𝐴𝐴 𝐴𝐷𝐺𝐴𝐴 )]

𝑆𝐻𝐺𝐶1 =
𝐴𝑡
Where
SHGCf = Frame SHGC
Af = Frame area

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© 2013, 2023. National Fenestration Rating Council Incorporated (NFRC). All rights reserved.
 SHGClf = Lite frame SHGC
Alf = Lite frame area
SHGCd = Divider SHGC
Ad = Divider area
SHGCde = Edge-of-divider SHGC
Ade = Divider area
SHGCeg = Edge-of-lite SHGC
Aeg = Edge-of-lite area
SHGCc = Center-of-lite SHGC
Ac = Center-of-lite Area
SHGCdc = Door or Sidelite core SHGC
Adc = Door or Sidelite core area
SHGCp = Panel SHGC
Ap = Panel area
SHGCep = Edge-of-panel SHGC
Aep = Edge-of-panel area
SHGC0DGAA = Doorglass Assembly Area SHGC with a center-of-glass SHGCc of
0.00
SHGC1DGAA = Doorglass Assembly Area SHGC with a center-of-glass SHGCc of
1.00
ADGAA = Doorglass Assembly Area at ¼ Lite, ½ Lite, ¾ Lite, Full-Lite
SHGCsd = SGHC of Door Slab & Frame/Sill Opaque area
Asd = Opaque Area of NFRC Model Size Swinging Door, or Sidelite, for 1/4
lite, 1/2 lite, 3/4 lite, full-lite and complete opaque configurations
At = Total Area
SHGC0 = Representative SHGC of product with a COG SHGC = 0.00
SHGC1 = Representative SHGC of product with a COG SHGC = 1.00

5.2.2.2 Determining Whole Product SHGC

For any SHGCc, the total SHGC can be calculated using
SHGC0 and SHGC1 determined from 5.2.2.1 and input
into Equation 4-1.

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 5.2.2.3 Determining VT0 and VT1
The opaque door area (that is, the area outside the
DGAA, including door frame and sill) shall be simulated
in five configurations, calculated per Equation 5-4, for the
opaque, ¼ lite, ½ lite, ¾ lite, and full-lite opaque areas;
The DGAA of the door shall be simulated using 4
configurations, calculated per Equation 5-5, at the ¼ lite,
½ lite, ¾ lite and full-lite sizes (See Figure 5-10 in
ANSI/NFRC 100 for door slab with various panel sizes);
Equation 5-6:

𝑉𝑇𝑠𝑑 𝐴𝑠𝑑 = [(𝑉𝑇𝑓 𝐴𝑓 ) + (𝑉𝑇𝑑𝑐 𝐴𝑑𝑐 ) + (𝑉𝑇𝑝 𝐴𝑝 ) + (𝑉𝑇𝑒𝑝 𝐴𝑒𝑝 )]

Equation 5-7: For VT0 of DGAA:

𝑉𝑇0𝐷𝐺𝐴𝐴 𝐴𝐷𝐺𝐴𝐴 = [(𝑉𝑇𝑙𝑓 𝐴𝑙𝑓 ) + (𝑉𝑇𝑑 𝐴𝑑 ) + (𝑉𝑇𝑑𝑒 𝐴𝑑𝑒 ) + (𝑉𝑇𝑒𝑔 𝐴𝑒𝑔 )]

Equation 5-8: For VT1 of DGAA:

𝑉𝑇1𝐷𝐺𝐴𝐴 𝐴𝐷𝐺𝐴𝐴 = [(𝑉𝑇𝑙𝑓 𝐴𝑙𝑓 ) + (𝑉𝑇𝑑 𝐴𝑑 ) + (𝑉𝑇𝑑𝑒 𝐴𝑑𝑒 ) + (𝑉𝑇𝑒𝑔 𝐴𝑒𝑔 ) + (𝐴𝑐 )]
Equation 5-9:

[(𝑉𝑇𝑠𝑑 𝐴𝑠𝑑 ) + (𝑉𝑇0𝐷𝐺𝐴𝐴 𝐴𝐷𝐺𝐴𝐴 )]

𝑉𝑇0 =
𝐴𝑡
Equation 5-10:

[(𝑉𝑇𝑠𝑑 𝐴𝑠𝑑 ) + (𝑉𝑇1𝐷𝐺𝐴𝐴 𝐴𝐷𝐺𝐴𝐴 )]

𝑉𝑇1 =
𝐴𝑡
Where
VTf = Frame VT
Af = Frame area
VTlf = Lite frame VT
Alf = Lite frame area
VTd = Divider VT
Ad = Divider area
VTde = Edge-of-divider VT
Ade = Divider area
VTeg = Edge-of-lite VT
Aeg = Edge-of-lite area
VTc = Center-of-lite VT
Ac = Center-of-lite Area

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 VTdc = Door or Sidelite core VT
Adc = Door or Sidelite core area
VTp = Panel VT
Ap = Panel area
VTep = Edge-of-panel VT
Aep = Edge-of-panel area
VT0DGAA = Doorglass Assembly Area SHGC with a center-of-glass VTc of 0.00
VT1DGAA = Doorglass Assembly Area SHGC with a center-of-glass VTc of 1.00
ADGAA = Doorglass Assembly Area at ¼ Lite, ½ Lite, ¾ Lite, Full-Lite
VTsd = VT of Door Slab & Frame/Sill Opaque area
Asd = Opaque Area of NFRC Model Size Swinging Door, or Sidelite, for 1/4
lite, 1/2 lite, 3/4 lite, full-lite and complete opaque configurations
At = Total Area
VT0 = Representative VT of product with a COG VT = 0.00
VT1 = Representative VT of product with a COG VT = 1.00

5.2.2.4 Determining Whole Product VT

For any VTc, the total VT can be calculated using VT0
and VT1 determined from 5.2.2.3 and input into Equation
4-2.

5.2.3 Determining Table of SHGC and VT 0 and 1 Values for

Grouped Sightlines (See 5.1.1)

5.3 Skylights

5.3.1 Determining Table of SHGC and VT 0 and 1 Values for

Grouped Sightlines (See 5.1.1)

5.4 Tubular Daylighting Devices

None

5.5 Garage (Vehicular Access) Doors

5.5.1 Scope
This section presents and references methods for determining
specific garage door system solar heat gain properties or quantities
used in the determination of these properties, where garage doors
consist of both panel areas and glazed areas. At this time, the
scope of these properties is limited to total garage door system
SHGC.
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 5.5.2 Variations from Standard Product Lines
A given series of garage door systems defined by skin material and
glazing material construction that differ only in:
A. Size;
B. Solid panel and panel cut-out configurations;
C. The replacement of core or a panel area with a glazing
system;
D. Center-of-glazing characteristics, such as glazing types, gap
widths, glazing areas, use of dividers, use of spacers,
glazing coatings, and/or gas fills.

5.5.3 Variations from Standard Individual Products

An individual product, in a product line, shall be those products that
comply with the requirements per Section 5.5.2.

5.5.4 Variations from Standard Simulation and Test Conditions

A. In accordance with U-factor validation testing to ANSI/NFRC
100 for simulated garage door products, sectional garage
doors shall have the SHGC determined based on a
specimen filling a 2.13 m (7 ft) wide by 2.13 m (7 ft) tall
opening (the aperture is smaller than the test specimen).
B. Glazing shall be per the manufacturer’s design. If grids or
dividers are normally used in garage door glazing, those
grids and dividers shall be included for modeling purposes.
C. Door opening framing and sill shall be included in SHGC
calculations. The framing (nominal 2 x 4) and the sill
(nominal 2 x 6) shall consist of 38 mm (1.5 in) wood
surrounding the perimeter of the door.

5.5.5 Total Product Rating

The total garage door system SHGC shall be calculated as outlined
below:
A. Determine all of the following, as applicable:
i. Top rail SHGC
ii. Bottom rail SHGC
iii. End stile SHGC
iv. Center-of-glazing SHGC
v. Glazing framing SHGC
vi. Divider SHGC

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 vii. Edge-of-divider SHGC
viii. Door panel core SHGC. This will only include
portions of those top, intermediate, and bottom panels
that are not glazed, and excludes glazing framing, top
rail, bottom rail, and end stile areas
ix. The component areas in square feet, to the nearest
0.001 m2 (0.010 ft2) of:
(a) Top rail area
(b) Bottom rail area
(c) End stile area
(d) Center-of-glazing area
(e) Glazing framing area
(f) Divider area
(g) Edge-of-divider area
(h) Door panel core area
(i) Projected total exterior door system area
(framing and sill areas)
B. Perform the following calculations as shown in Equation 5-
11:
i. Multiply the top rail, bottom rail, end stile, center-of-
glazing, glazing framing, and door core SHGCs by
their corresponding areas.
ii. Total these six quantities; and
iii. Divide this total by the projected total exterior garage
door system area to produce computed total garage
door system product SHGCs for all the door systems
in the matrix of required SHGCs.
Equation 5-11

(𝑆𝐻𝐺𝐶𝑡𝑟 𝐴𝑡𝑟 ) + (𝑆𝐻𝐺𝐶𝑏𝑟 𝐴𝑏𝑟 ) + (𝑆𝐻𝐺𝐶𝑒𝑠 𝐴𝑒𝑠 ) + (𝑆𝐻𝐺𝐶𝑐𝑔 𝐴𝑐𝑔 ) + (𝑆𝐻𝐺𝐶𝑔𝑓 𝐴𝑔𝑓 ) +
[ ]
(𝑆𝐻𝐺𝐶𝑑 𝐴𝑑 ) + (𝑆𝐻𝐺𝐶𝑑𝑒 𝐴𝑑𝑒 ) + (𝑆𝐻𝐺𝐶𝑑𝑐 𝐴𝑑𝑐 )
𝑆𝐻𝐺𝐶𝑡 =
𝐴𝑝𝑡
Where
SHGCt = total door system SHGC
SHGCtr = top rail SHGC
Atr = top rail area
SHGCbr = bottom rail SHGC

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© 2013, 2023. National Fenestration Rating Council Incorporated (NFRC). All rights reserved.
 Abr = bottom rail area
SHGCes = end stile SHGC
Aes = end stile area
SHGCcg = center-of-glazing SHGC
Acg = center-of-glazing area
SHGCgf = glazing framing SHGC
Agf = glazing framing area
SHGCd = divider SHGC
Ad = divider area
SHGCde = edge-of-divider SHGC
Ade = edge-of-divider area
SHGCdc = door panel core SHGC
Adc = door panel core area
Apt = projected total door system area

5.6 Site Built

None

5.7 Applied Films

5.7.1 Scope
This section presents additional details specific to applied film
products.
This section presents and references methods for determining
specific applied film with reference fenestration products Solar Heat
Gain Coefficient (SHGC) and Visible Transmittance (VT).
Note: Films factory-applied to glazing prior to fenestration
product fabrication and installation are already covered as
glazing options by NFRC 200 and shall not be rated according to
the procedure of Section 5.7.

5.7.2 Variations from Standard Product Lines

None

5.7.3 Variations from Standard Individual Products

None

5.7.4 Variations from Standard Simulation and Test Conditions

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 5.7.4.1 Approved Center-of-Glazing Computational Program
Approved center-of-glazing software (see Reference 4)
shall be used to determine SHGCc and VTc.
NFRC-approved solar optical data shall be used for the
film installed on 3 mm (1/8 in) clear glass, 6 mm (1/4 in)
clear glass, and 6 mm (1/4 in) grey glass. Any pane of 3
mm (1/8 in) clear glass may be used that has a center-of-
glazing SHGCc of 0.86  0.02 when modeled in
configuration A (below) without the film installed. Any
pane of 6 mm (1/4 in) clear glass may be used that has a
center-of-glazing SHGCc of 0.82  0.02 when modeled in
configuration B (below) without the film installed. Any
grey glass may be used that has a center-of-glazing
SHGCc of 0.59  0.02 when modeled in configuration C
(below) without the film installed.

The following reference glazing systems shall be

simulated with and without the film installed:
A. Single 3 mm (1/8 in) Clear;
B. Single 6 mm (1/4 in) Clear;
C. Single 6 mm (1/4 in) Grey;
D. Double 3 mm (1/8 in) Clear/3 mm (1/8 in) Clear: 7
mm (0.3 in) air gap;
E. Double 6mm (1/4 in) Clear/ 6 mm (1/4 in) Clear:
12.7 mm air gap; and
F. Double 6 mm (1/4 in) Grey/ 6mm (1/4 in) Clear:
12.7 mm air gap.
The position (surface number) of the film when installed
on the glazing system shall be documented (i.e., #1 to
#4). This will yield the following matrix:

Table 5-1 Center-of-Glazing Values -- SHGCc and VTc

Reference Glazing Without Film With Film
System SHGCc VTc Film Position SHGCc VTc
3 mm (1/8 in) clear 0.859 0.899
6 mm (1/4 in) clear 0.816 0.884
6 mm (1/4 in) grey 0.576 0.444
3 mm (1/8 in) clear 0.761 0.814
3 mm (1/8 in) clear

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 Reference Glazing Without Film With Film
System SHGCc VTc Film Position SHGCc VTc
6 mm (1/4 in) clear 0.702 0.786
6 mm (1/4 in) clear
6 mm (1/4 in) grey 0.454 0.395
6 mm (1/4 in) clear

5.7.5 Calculation of Total Product Rating

The reference fenestration product and applied film product SHGC
and VT shall be calculated as outlined below:

Table 5-2 Values of SHGC0 and SHGC1 and VT0 and VT1 for Reference Products
Operator Reference Reference
Type Frame Glazing SHGC0 SHGC1 VT0 VT1
All 3 mm
Residential
Aluminum (1/8 in) 0.011858 0.830317 0.000000 0.818459
Fixed
options
Non-
All 6 mm
Residential
Aluminum (1/4 in) 0.015962 0.892832 0.000000 0.87687
Window
options
wall

5.7.5.1 Reference Fenestration Products

The construction of reference fenestration products
that shall be used are listed in Table 5-3, along with
their pre-calculated SHGC0/SHGC1 and VT0/VT1
values. Calculate the total fenestration product SHGC
and VT for each reference fenestration product and
the corresponding applied film product according to
Section 5.7.5.2 and Section 5.7.5.3. This will result in
the matrix in Table 5-3 for each film product, where
SHGC and VT values for ‘no film’ refer to the
reference fenestration product and values ‘with film’
refer to the applied film product.

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 Table 5-3 Values of SHGC and VT for Reference Fenestration Products and
Applied Film
Reference Product SHGC VT
Operator Reference Reference with with
Type Frame Glazing no film film no film film
Residential 3 mm (1/8 in)
Aluminum 0.72 0.74
Fixed clear
6 mm (1/4 in)
Non- 0.73 0.78
clear
Residential Aluminum
6 mm (1/4 in)
Windowwall 0.52 0.39
grey
3 mm (1/8 in)
Residential clear
Aluminum 0.64 0.67
Fixed 3 mm (1/8 in)
clear
6 mm (1/4 in)
clear 6 mm (1/4 0.63 0.69
Non-
in) clear
Residential Aluminum
6 mm (1/4 in)
Windowwall
grey 6 mm (1/4 0.41 0.35
in) clear

5.7.5.2 Total Fenestration Product SHGC

Calculate the total fenestration product SHGC for
each reference fenestration product and the
corresponding applied film product using the following
equation:
Equation 5-12
𝑆𝐻𝐺𝐶 = 𝑆𝐻𝐺𝐶0 + 𝑆𝐻𝐺𝐶𝑐 (𝑆𝐻𝐺𝐶1 − 𝑆𝐻𝐺𝐶0 )
Where
SHGC0 = The total fenestration product SHGC for the center-
of-glazing SHGC of 0.0 from column 4 of Table 5-2
SHGC1 = The total fenestration product SHGC for the center-
of-glazing SHGC of 1.0 from column 5 of Table 5-2
SHGCc = The center-of-glazing SHGC for the reference
glazing or the reference glazing with the film applied,
from columns 2 and 5 of Table 5-1, according to
Section 5.7.4.1 above
Perform the calculations with SHGCc, SHGC0, and
SHGC1 values to six significant digits. Report the final
SHGC value to two significant digits.

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 5.7.5.3 Total Fenestration Product VT
Calculate the total fenestration product VT for each
reference fenestration product and the corresponding
applied film using the following equation:

𝑉𝑇 = 𝑉𝑇0 + 𝑉𝑇𝑐 (𝑉𝑇1 − 𝑉𝑇0 ) Equation 5-13

𝑉𝑇 = 𝑉𝑇0 + 𝑉𝑇𝑐 (𝑉𝑇1 − 𝑉𝑇0 )
Where
VT0 = The total fenestration product VT for the center-of-
glazing VT of 0.0 from column 6 of Table 5-2
VT1 = The total fenestration product VT for the center-of-
glazing VT of 1.0 from column 7 of Table 5-2
VTc = The center-of-glazing VT for the reference glazing or
reference glazing with the film applied, from columns
3 and 6 of Table 5-1, according to Section 5.7.4.1

Perform the calculations with VTc, VT0, and VT1 values to

six significant digits. Report the final VT value to two
significant digits.

5.7.6 Testing
If a fenestration product with applied film cannot be simulated in
accordance with Section 5.7.4.1, the center-of-glazing test
procedure in Section 5.7 shall be used to determine the SHGC and
VT of the reference fenestration product glazing system with
applied film. These values shall be used to calculate the total
product SHGC and VT according to Section 5.7.5 above.

5.7.6.1 Center-of-Glazing Component Test Procedure

The center-of-glazing component SHGC (SHGCc)
shall be tested in accordance with NFRC 201 – see
Section 7.2.2.1 of NFRC 201 for details on how to
install a center-of-glazing specimen for testing.
Guidance for the appropriate use of NFRC’s approved
procedure for Center-of-Glazing Component Test
Procedure (VTc) will be published as an addendum to
this procedure or as a Technical Interpretation.

5.7.6.2 Total Fenestration Product Test Procedure

Not applicable – the frame and edge-of-glazing SHGC
and VT values of reference fenestration products
must be simulated.

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 5.7.6.3 Total Fenestration Product SHGC for Non-Model
Sizes
Not applicable – all reference fenestration products
with applied films are to be at model sizes.

5.7.7 Figures

Figure 5-1 Residential Fixed Aluminum Frame Reference Product

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© 2013, 2023. National Fenestration Rating Council Incorporated (NFRC). All rights reserved.
 Figure 5-2 Non-residential Windowwall Aluminum Frame Reference Product

Figure 5-3 Cross Section A

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© 2013, 2023. National Fenestration Rating Council Incorporated (NFRC). All rights reserved.
 Figure 5-4 Cross Section B

5.8 Dynamic Attachment Products for Swinging Doors

Rating procedures for full and half glazed swinging doors shall be used
with the dynamic attachment in the “fully open” and “fully closed” positions.

5.8.1 Scope
This section presents additional details specific to Dynamic
Attachments for Swinging Doors (DASD). This section presents and
references methods for determining specific DASD SHGC and VT.

5.8.2 Methodology
Methodology for rating Full and Half Lite Swinging Doors can be
found in Section 5.2. DASD products will be rated using reference
Swinging Doors outlined in ANSI/NFRC 100 Section 5.7.

5.8.3 Approved Computational Program

The DASD Product’s SHGC and VT shall be determined using
approved glazed swinging door simulation. The DASD shall be
modeled on the reference swinging doors indicated in ANSI/NFRC
100 Section 5.7.3.

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© 2013, 2023. National Fenestration Rating Council Incorporated (NFRC). All rights reserved.
 5.9 Component Modeling Approach (CMA) for Non-Residential Building
Fenestration Products
This section covers methods for determining fenestration product SHGC
and VT for fenestration products installed in non-residential buildings,
including (but not limited to) fenestration products that are site assembled
(built). This section also covers methods for determining fenestration
product SHGC and VT for solarium/sunroom systems.

5.9.1 Scope
To specify a method for determining the SHGC and VT of non-
residential fenestration systems, including site-built fenestration
systems for non-residential buildings.
The ratings derived from this procedure may be used to compare
thermal performance characteristics of non-residential fenestration
systems and/or to provide architects, code specifiers, builders, etc.,
with a uniform and accurate means of determining and evaluating
thermal performance characteristics of a specifically designed non-
residential fenestration system. As an alternative, ratings
determined in accordance with Section 4 are permitted.

5.9.2 Variations from Standard Product Lines

Non-residential fenestration systems covered by this method
include products that are listed in ANSI/NFRC 100, Table 4-3,
including (but not limited to):
A. Transparent and translucent wall systems where the glazing
material is glass, plastic, or other light transmitting panels
(including opaque spandrel panels within the system),
except those products where no testing or calculation
procedure exists;
B. Glazed wall support and framing systems;
C. Changes made to a product type to address structural loads,
e.g., changes made to frame components to build different
size products, address wind-loads, and aesthetics.
D. Products with single or multiple glazing layers;
E. Products with spacer systems between glazings;
F. Horizontal, vertical, and sloped systems;
G. Products that, by design, may have multiple framing
components and/or glazing combinations;
H. Fenestration systems using Unitized Construction, where a
system is field assembled from factory assembled sub-units.

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© 2013, 2023. National Fenestration Rating Council Incorporated (NFRC). All rights reserved.
 I. Spandrel panel systems only with NFRC approved glazing
layers in the IGDB. That is, panels without opaque metal
skin insulation and/or fire safing; and
J. Non-residential products or systems not covered by
ANSI/NFRC 100 Section 4.4, Table 4-3.
Combination assembly with common frame treatment: A
combination assembly that includes common frame members that
wrap around the assembly and/or contain common mullion
members that connect various individual products, so that the
fenestration assembly is a single product and installed as such. A
combination assembly with a common frame shall be treated as an
assembly consisting of individual products and rated as such
unless the heat flow through the common frame members differs by
more than 20% from the heat flow through the frame assemblies of
individual products. The heat flow shall be calculated using the
best glazing option for individual cross-sections of common frame
members, and their frame U-factors shall be compared to the
respective frame U-factor of the individual cross-sections in the
assembly.

5.9.3 Variations from Standard Individual Products

The following products and product configurations have special
provisions:
A. Single glazed products and
B. Double-sash products.

5.9.4 Variations from Standard Simulation and Test Conditions

A. For single glazed products, framing members shall be
modeled using single glazing best and worst options, as
detailed in Section 5.9.5.3.
B. For double-sash products, framing members shall be
modeled using the same distribution of best/worst insulating
and single glazing as in actual product. For example, if the
actual product incorporates insulating glass (IG) and single
glazing in a double-sash configuration, best/worst options
should incorporate best/worst IG + single glazing. Reverse
product configuration (i.e., single + IG) shall also result in
modeling frame members using the single + IG best/worst
option. If double sash incorporates IG + IG configuration,
that needs to be reflected in best/worst modeling.

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© 2013, 2023. National Fenestration Rating Council Incorporated (NFRC). All rights reserved.
 C. Simplifications to a Product Line – Frame Components

This section presents additional product line simplification

rules specific to frame components.

Frame Grouping
All grouping rules contained in Section 4 shall be permitted
to be utilized with the calculation procedures of Section 5.6.
In addition, if the frames are grouped by U-factor in
accordance with ANSI/NFRC 100, Sections 4 and 5.9, the
frame SHGC (SHGCf) shall be calculated in accordance with
Section 5.6.5 by using the frame U-factor group leader and
the actual individual frame component projected frame depth
(PFD) within that group.

5.9.5 Calculation of Total Product Rating

5.9.5.1 Component Modeling Procedure

The SHGC and VT rating of a fenestration product may
vary by size. In order to provide a uniform rating
procedure, as well as size specific information, the
component modeling procedure as described in this
section shall be used as the primary method. For the
comparison rating of non-residential systems, the SHGC
and VT rating for model (standard) size per ANSI/NFRC
100 Table 4-3 is calculated. SHGC and VT ratings for
sizes other than standard size can be calculated for
informational purposes when applicable.

5.9.5.2 Basic Product Line Model and Component

Information for Calculating and Reporting SHGC and
VT
SHGC and VT shall be reported on a component basis
for each frame assembly (i.e., sill, jambs, head, etc.),
each spacer configuration, and each glazing system
(center-of-glass). The SHGC and VT for frame
components shall be reported as SHGCf and VTf (i.e.,
frame SHGC and VT) using the four representative
options (Low and High), as defined in Table 5-4, and
which gives a template for reporting SHGC and VT.

5.9.5.3 Definition of Low and High Configurations

A total of four Low/High or L/H configurations are defined.
The glazing and spacers used in the L/H configurations
are defined in ANSI/NFRC 100 with the best glazing

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© 2013, 2023. National Fenestration Rating Council Incorporated (NFRC). All rights reserved.
 system SHGCcog < 0.2. In the case of single glazing
systems, use the best glazing with SHGCcog < 0.3 and
clear glass for the worst glazing option.
These configurations are assembled from two different
glazing options at the extreme ends of thermal
performance and two spacer configurations at the
extreme ends of thermal performance. The following are
four Low and High configurations:
A. Low glazing with low spacer;
B. Low glazing with high spacer;
C. High glazing with low spacer; and
D. High glazing with high spacer.
For each individual product, total fenestration product
SHGC and VT shall be reported for the specified
configuration at the model size, as shown in Table 4-3 of
ANSI/NFRC 100. The calculation of this total product
SHGC and VT is done using procedure detailed in
Reference [10].

5.9.5.4 Approved Total Fenestration Product SHGC

Calculation Procedure
The total fenestration product SHGC and VT calculation
procedure shall be calculated as per the procedure
detailed in Reference [10].
Approved software shall be used for calculating the total
fenestration product SHGC and VT. NFRC-approved
software is listed in Reference 4.
Follow the NFRC-approved procedure for rounding the
final result. The SHGC and VT rating shall be reported to
X.XX decimals. All variables used in the formula shall be
expressed to at least three significant decimal places.

5.9.5.5 Determining SHGC and VT for Sloped Glazing

Systems
All sloped glazing systems shall be rated for SHGC and
VT at a slope of 90o above the horizontal.

5.9.5.6 Approved Total Fenestration Product SHGC and VT

for Non-Model Sizes
The procedure in Reference [10] and NFRC-approved
software as defined in Section 5.9.5.1 shall be used to
determine size specific product indices.
ANSI/NFRC 200-2023[E0A0] Page 41

© 2013, 2023. National Fenestration Rating Council Incorporated (NFRC). All rights reserved.
6. REFERENCES
1) ANSI/NFRC 100-2023: Procedure for Determining Fenestration Product U-
factors. National Fenestration Rating Council: Greenbelt, MD; 2014.
www.nfrc.org.
2) NFRC 201-2023: Procedure for Interim Standard Test Method for Measuring
the Solar Heat Gain Coefficient of Fenestration Systems Using Calorimetry
Hot Box Methods. National Fenestration Rating Council: Greenbelt, MD; 2014.
www.nfrc.org.
3) ANSI/NFRC 202-2023: Procedure for Determining Translucent Fenestration
Product Visible Transmittance at Normal Incidence. National Fenestration
Rating Council: Greenbelt, MD; 2014. www.nfrc.org.
4) ANSI/NFRC 203-2023: Procedure for Determining Visible Transmittance of
Tubular Daylighting Devices. National Fenestration Rating Council: Greenbelt,
MD; 2014. www.nfrc.org.
5) NFRC 300-2020: Test Method for Determining the Solar Optical Properties of
Glazing Materials and Systems. National Fenestration Rating Council:
Greenbelt, MD; 2014. www.nfrc.org.
6) NFRC 600: Glossary and Terminology. National Fenestration Rating Council:
Greenbelt, MD; 2014 www.nfrc.org.
7) NFRC THERM7 / WINDOW7 Simulation Manual. National Fenestration Rating
Council: Greenbelt, MD. www.nfrc.org.
8) List of Approved Simulation Computer Programs. National Fenestration Rating
Council: Greenbelt, MD. www.nfrc.org.
9) ISO/FDIS 15099. Thermal Performance of Windows, Doors and Shading
Device-– Detailed Calculations. International Organization for Standardization:
Geneva, Switzerland. www.iso.org
10) ASTM Standard C 1172. “Standard Specification for Laminated Architectural
Flat Glass.” ASTM International, West Conshohocken, PA, 2009, DOI:
10.1520/C1172-09, www.astm.org.
11) ASTM Standard C 1036. “Standard Specification for Flat Glass,” ASTM
International, West Conshohocken, PA, 2006, DOI: 10.1520/C1036-06,
www.astm.org.
12) ASTM Standard C 1048. “Standard Specification for Heat-Treated Flat
Glass—Kind HS, Kind FT Coated and Uncoated Glass.” ASTM International,
West Conshohocken, PA, 2004, DOI: 10.1520/C1048-04, www.astm.org.
13) CIE “Colorimetry Technical Report.” 15:2004 (3rd Edition). International
Commission on Illumination (CIE), Vienna, Austria. www.cie.co.at.

ANSI/NFRC 200-2023[E0A0] Page 42

© 2013, 2023. National Fenestration Rating Council Incorporated (NFRC). All rights reserved.
 14) Curcija DC, Bhandari MS, Manteghi M, Shah BV. “Component Modeling
Methodology for Predicting Thermal Performance of Non-Residential
Fenestration Systems,” Thermal Performance of Building Envelopes IX,
Clearwater, FL. December 2004.
15) LBNL Calculation of Optical Properties for a Venetian Blind Type of Shading
Device, October 20, 2006. Lawrence Berkeley National Laboratory, Berkeley,
CA, http://windows.lbl.gov/software/window/6/TechnicalDocs.html
16) LBNL TARCOG: Mathematical Models for Calculation of Thermal Performance
of Glazing Systems with or without Shading Devices, October 17, 2006.
Lawrence Berkeley National Laboratory, Berkeley, CA,
http://windows.lbl.gov/software/window/6/TechnicalDocs.html
17) Vidanovic, S.; Kohler, C.J.; Curcija, D.C. "Optical Model of Fritted Glazing".
LBNL Technical Report. January 25, 2012.
http://windows.lbl.gov/software/window/6/TechnicalDocs.html
18) LBNL A New Method for Predicting the Solar Heat Gain of Complex
Fenestration Systems. I. Overview and Derivation of the Matrix Layer
Calculation, 1993. Lawrence Berkeley National Laboratory, Berkeley, CA,
http://windows.lbl.gov/software/window/6/TechnicalDocs.html
19) Curcija, D.C.; Hart, R.G. "Modeling Thermal Performance of VIG: WINDOW
and THERM software tools". LBNL Technical Report. Berkeley, CA.
https://windows.lbl.gov/sites/default/files/software/WINDOW/ModelingThermal
PerformanceofVIG_withRef.pdf
20) Hart, R.H.; and Curcija, D.C. 2013. “Modeling of Vacuum Insulating Glazing.”
Proceedings of the Thermal Performance of Building Envelopes XII,
Clearwater Beach, Fl. December 2013

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APPENDIX A (NON-MANDATORY INFORMATION)
Determination of SHGC and VT at Non-Standard Sizes
A.1 The approved total fenestration product SHGC and VT calculation
procedure may be used to evaluate the total fenestration product SHGC
and VT for size configurations other than the Model Sizes for purposes
other than certification.

A.2 Determination of SHGCs and VTs for Dynamic Glazing Products at

additional slat angles
Determination of SHGCs and VTs for Dynamic Glazing Products with
slatted blinds between glass shall be permitted at slat tilt angles other than
Fully ON/CLOSED and Fully OFF/OPEN, Additional slat angles of -45º
and +45º shall be permitted as optional ratings that may be added to the
CPD.
See figure below for angle descriptions.

Outdoor
Indoor

Positive tilt angle shown

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 edge-of-glazing U-Factor 34
INDEX F
Fenestration 1, 2, 4, 5, 7, 9, 10, 12, 14, 17,
A 18, 19, 20, 21, 22, 23, 24, 34, 36, 37, 38, 39,
Absorptance 14 42, 43, 45, 47, 48, 49, 50
Accreditation Program ii Attachment 5
Air Leakage i, ii System 2, 4, 5, 42, 43, 49
Angle of Incidence 4 Film 3, 4, 34, 35, 36, 37, 38
Angular Selectivity 4 frame 32
Area 15, 20, 21, 22, 23, 24, 35, 41, 43, 45, Frame 1, 10, 14, 17, 20, 21, 22, 23, 24, 36,
50 37, 39, 40, 43, 44, 45
Center-of-glazing 22, 24 G
Divider 7, 8, 20, 22, 24 Gap Width 2, 10
Edge-of-divider 7, 21, 22, 24 garage door 31, 32, 33
Frame 7, 8, 21, 22, 24 Gas-fill 2
Projected Fenestration Product Area 22, Glass 1, 2, 4, 14, 26, 35, 43, 44, 45, 48
23, 24 Laminated 1, 15
Total Fenestration Product Area 15, 35, 41, Glazing 1, 2, 4, 10, 11, 14, 15, 16, 17, 18, 19,
43, 45, 50 20, 21, 22, 23, 24, 34, 35, 36, 37, 38, 39, 43,
Attachment 2 44, 45, 46, 48
C Patterned 2
Calibration Transfer Standard 13 Sloped 14, 47
Caming 10, 14, 26 Glazing System 2, 14, 36, 38, 45
CAP ii Greenhouse/Garden Window 3
CAR ii Group Leader 11, 45
center-of-glazing 32 Grouping 10, 14, 44, 45
Center-of-Glazing 7, 9, 10, 12, 14, 15, H
17, 18, 19, 20, 21, 22, 23, 24, 35, 36, 37, 38, Head 45
45 I
center-of-glazing area 34, 57 IA v
center-of-glazing U-Factor 34 Independent Certification and Inspection
Certification 50 Agency
Certified Products Directory ii IA i, ii
Combination Assembly 43 Individual Product 10, 12, 14, 17, 35, 43,
Compliance and Monitoring Program ii 47
Condensation Resistance i L
CR ii Laboratory Accreditation Program i, ii
core material 31 LAP i, ii
Curtain Wall 14 Lite 26, 42
D M
Divider 10, 14, 18, 20, 21, 22, 23, 24, 26 Model Size 12, 14, 39, 47, 50
dividers 31 Mullion 43
Door N
Exterior 1 NFRC Label ii
Sliding Glass 24 O
door core area 34 Opaque 3, 20, 43
door core U-Factor 34 Operator Type 36, 37
doors 31 P
Dynamic Attachment 42 panels 31
Dynamic Glazing 1, 11, 16 Product Certification Program i, ii
Dynamic Glazing Product 16 PCP i, ii
E Product Line 9, 10, 14, 15, 17, 34, 42, 44,
edge-of-glazing 32 45
edge-of-glazing area 34 Product Type 43
R

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Radiation 1 Casement 1
Rating 11, 12, 16, 18, 26, 30, 36, 42, 45, 47, Fixed 1
48 Horizontal Sliding 1
Rating System i, ii Vertical Sliding 1
Reference Fenestration Product 5, 34, 36, 37, Wall 36
38, 39 Wood 1
Reference Glazing System 35, 36
Reflectance 2, 3
S
Sash 7, 8, 10, 44
Sill 45
Solar 1, 2, 4, 7, 12, 34, 35, 48
Solar Heat Gain 1, 4, 7, 34
Solar Heat Gain Coefficient 1, 2, 3, 4, 7,
10, 11, 12, 14, 15, 17, 18, 19, 20, 21, 22, 24,
26, 28, 30, 36, 37, 38, 39, 42, 45, 47, 50
Divider 22
Edge-of-divider 22, 24
Edge-of-glazing 22
Frame 22, 45
Solar Radiation 1, 7
Spacer 2, 10, 14, 43, 45, 46
Spacer System 2, 43
Spandrel 43
Specular 1, 2, 3, 4
Sunroom 42
T
Temporary Label v
total door system U-Factor 34
Translucent 2, 3, 14, 43
Transmittance 1, 2, 3, 4, 34
Transparent 2, 14, 43
Tubular Daylighting Device 3, 31
U
U-factor
Center-of-glazing 10
Divider 10, 14, 20
Frame 10, 17, 43, 45
V
Visible Transmittance i, 1, 4, 8, 9, 11, 14,
15, 17, 18, 19, 20, 22, 24, 36, 37, 38, 39, 42,
45, 47, 48, 50
Center-of-glazing 14, 17, 19, 24, 35, 36,
38
Divider 24
Edge-of-divider 24
Edge-of-glazing 24
Frame 24, 45
VT i, ii
W
Wall
Glazed 1, 14, 43
Window 4, 14, 24, 36
Bay 2, 4
Bow 1

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