ABI expansion in My Phuoc 2
0742 DUCT ACCESSORIES
TABLE OF CONTENTS
1 GENERAL .......................................................................................................................................................... 3
1.1 SUMMARY ................................................................................................................................................ 3
1.2 REFERENCES ............................................................................................................................................. 3
1.3 SUBMITTALS ............................................................................................................................................. 4
1.4 CLOSEOUT SUBMITTALS ........................................................................................................................... 4
1.5 QUALIFICATIONS ...................................................................................................................................... 4
1.6 PRE-INSTALLATION MEETINGS................................................................................................................. 4
1.7 DELIVERY, STORAGE, AND HANDLING ..................................................................................................... 4
1.8 FIELD MEASUREMENTS ............................................................................................................................ 4
1.9 COORDINATION........................................................................................................................................ 4
1.10 WARRANTY ............................................................................................................................................. 4
1.11 EXTRA MATERIALS.................................................................................................................................. 5
2 PRODUCTS ....................................................................................................................................................... 5
2.1 BACK-DRAFT DAMPERS ............................................................................................................................ 5
2.2 COMBINATION FIRE AND SMOKE DAMPERS ........................................................................................... 5
2.3 DUCT ACCESS DOORS ............................................................................................................................... 6
2.4 FIRE DAMPERS.......................................................................................................................................... 6
2.5 SMOKE DAMPERS..................................................................................................................................... 7
2.6 VOLUME CONTROL DAMPERS ................................................................................................................. 7
2.7 FLEXIBLE DUCT CONNECTIONS ................................................................................................................ 9
2.8 DUCT TEST HOLES..................................................................................................................................... 9
3 EXECUTION ...................................................................................................................................................... 9
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ABI expansion in My Phuoc 2
3.1 EXAMINATION .......................................................................................................................................... 9
3.2 INSTALLATION. ......................................................................................................................................... 9
3.3 DEMONSTRATION .................................................................................................................................. 10
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1 GENERAL
1.1 SUMMARY
a) Section Includes:
1. Back-draft dampers.
2. Combination fire-and-smoke dampers.
3. Duct access doors.
4. Fire dampers.
5. Smoke dampers.
6. Volume control dampers.
7. Flexible duct connections
8. Duct test holes.
b) Related Sections:
All relevant mechanical and electrical sections.
1.2 REFERENCES
a) The ductwork accessories shall comply fully with the latest relevant British or American
standards and codes.
b) The following standards are the most commonly used, however the contractor shall comply
with all relevant standards whether listed or not
1. NFPA 90A - Standard for the Installation of Air Conditioning and Ventilating Systems.
2. NFPA 92A - Recommended Practice for Smoke-Control Systems.
3. NFPA 92B - Guide for Smoke Management Systems in Malls, Atria, and Large Areas
4. SMACNA - HVAC Duct Construction Standard - Metal and Flexible.
5. ASHRAE Standard 90.1-2001- Energy Standard for Buildings except Low-Rise Residential
Buildings.
6. UL 33 - Heat Responsive Links for Fire-Protection Service.
8. UL 555S - Leakage Rated Dampers for Use in Smoke Control Systems.
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1.3 SUBMITTALS
a) Shop Drawings: Indicate for shop fabricated assemblies including volume control dampers,
duct access doors and duct test holes.
b) Product Data: Submit data for shop fabricated assemblies including fire dampers including
locations and ratings, smoke dampers including locations and ratings, back draft dampers,
flexible duct connections, volume control dampers, duct access doors, duct test holes and
hardware used. Include electrical characteristics and connection requirements.
c) Manufacturer's Installation Instructions: Submit for Fire and Combination Smoke and Fire
Dampers.
d) Manufacturer's Certificate and contractor compliance sheet: Certify products meet or exceed
specified requirements including those furnished but not produced by manufacturer.
1.4 CLOSEOUT SUBMITTALS
a) Project Record Documents: Record actual locations of access doors, test holes, fire dampers,
smoke dampers, volume dampers and all duct accessories.
b) Operation and Maintenance Data: Submit for Combination Smoke and Fire Dampers, Fire
dampers and Smoke dampers.
1.5 QUALIFICATIONS
Manufacturer: Company specializing in manufacturing products specified in this section with
minimum ten years documented experience.
1.6 PRE-INSTALLATION MEETINGS
Convene minimum one week prior to commencing work of this section.
1.7 DELIVERY, STORAGE, AND HANDLING
Protect dampers from damage to operating linkages and blades.
1.8 FIELD MEASUREMENTS
Verify field measurements prior to fabrication.
1.9 COORDINATION
Coordinate Work where appropriate with building control Work.
1.10 WARRANTY
Furnish two year manufacturer warranty to include coverage for complete assembly including
materials and labor or as the period mentioned in the condition of contract whichever is greater.
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1.11 EXTRA MATERIALS
Furnish one of each size and type of fusible link.
2 PRODUCTS
2.1 BACK-DRAFT DAMPERS
a) Damper manufacturer's printed application and performance data including pressure,
velocity and temperature limitations shall be submitted for approval.
b) Testing and ratings to be in accordance with AMCA Standard 500.
c) Product Description: Multi-Blade, back-draft dampers: Parallel-action, gravity-balanced,
Galvanized 16 gage (1.5 mm) thick steel, or extruded aluminum. Blades, maximum 150 mm
width, center pivoted, with felt or flexible vinyl sealed edges. Blades linked together in rattle-
free manner with 90-degree stop, steel ball bearings, and plated steel pivot pin. Furnish
dampers with adjustment device to permit setting for varying differential static pressure.
2.2 COMBINATION FIRE AND SMOKE DAMPERS
a) Damper manufacturer's printed application and performance data including pressure,
velocity and temperature limitations shall be submitted for approval. Manufacturer submittal
data shall also present all air performance pressure drop data for the damper.
b) Combination Fire Smoke Dampers meeting the following specifications shall be furnished and
installed where shown on drawings. Dampers shall meet the requirements of the latest
edition of NFPA 90A, 92A, and 92B.
c) Dampers shall have a fire rating meet the requirements of the latest edition of QCVN, TCVN
standards.
d) Where required, the damper shall be installed with sleeve of thickness equal to damper
frame thickness and with the same fire rating as the damper.
e) For multiple-blade type dampers:
1. Fabricate with 16 gauge (1.5 mm) galvanized steel frame and blades.
2. Furnish oil-impregnated bronze or stainless steel sleeve bearings and plated steel axles,
stainless steel jamb seals, 3.2 x 12.7 mm plated steel concealed linkage, stainless steel
closure spring, blade stops, and lock, and 12.7 mm actuator shaft.
4. Actuator shall be labelled spring return electric type suitable for 240 volts, single phase,
50 Hz. Furnish end switches to indicate damper position. Locate damper operator on
exterior of duct and link to damper operating shaft.
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f) For curtain type normally open Smoke Responsive Fire Dampers:
1. Closing upon actuation of Electro thermal link, flexible stainless steel blade edge seals
to produce constant sealing pressure, stainless steel springs with locking devices to
maintain positive closure for units mounted horizontally.
2. The Electro-thermal fusible Link shall be: melting at 72°C; 240 volts, single phase, 50 Hz.
2.3 DUCT ACCESS DOORS
a) Fabricate in accordance with SMACNA “HVAC Duct Construction Standards - Metal and
Flexible”, and as indicated on Drawings.
b) Fabrication: Rigid and close fitting of galvanized steel with sealing gaskets and quick fastening
locking devices. For insulated ductwork, furnish minimum 25 mm thick insulation with sheet
metal cover.
1. Less Than 300 mm square, secure with sash locks.
2. Up to 450 mm Square: Furnish two hinges and two sash locks.
3. Up to 600 x 1200 mm: Three hinges and two compression latches with outside and
inside handles.
4. Larger Sizes: Furnish additional hinge.
5. Access panels with sheet metal screw fasteners are not acceptable.
2.4 FIRE DAMPERS
a) Damper manufacturer's printed application and performance data including pressure,
velocity and temperature limitations shall be submitted for approval. Manufacturer submittal
data shall also present all air performance pressure drop data for the damper
b) Fabricate in accordance with NFPA 90A, and manufacturer’s condition of listing. Permanently
mark dampers for use in dynamic systems.
c) Dampers shall have a fire rating meet the requirements of the latest edition of QCVN, TCVN
standards.
d) Where required, the damper shall be installed with sleeve of thickness equal to damper
frame thickness and with the same fire rating as the damper.
e) Fire dampers shall be of the curtain type. They shall comprise continuous folded interlock
blades contained within and arranged to close the opening of a surrounding frame. The
blades shall be constructed from 1.2 mm. thick cold reduced mild steel continuously hot
dipped galvanized with all cut edges protected with zinc chromate prime. Furnish stainless
steel closure springs and latches for closure under airflow conditions.
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f) The shutter shall be held in the open position out of the air streams by a fusible link and set
to separate at 72°C. The closing action of all shutter type dampers shall be actuated by means
of two constant force coiled band springs.
g) Shutter type fire dampers shall be sized to suit adjacent ductwork sizes and shall be manually
reset.
2.5 SMOKE DAMPERS
a) Damper manufacturer's printed application and performance data including pressure,
velocity and temperature limitations shall be submitted for approval. Manufacturer submittal
data shall also present all air performance pressure drop data for the damper.
b) Smoke dampers meeting the following specifications shall be furnished and installed where
shown on drawings. Dampers shall meet the requirements of the latest edition of NFPA 90A,
92A, and 92B.
c) Dampers: Class 1 curtain type fire dampers, normally open automatically operated by electric
actuator.
d) The Electro-thermal fusible Link shall be: melting at 72°C; 240 volts, single phase, 50 Hz.
2.6 VOLUME CONTROL DAMPERS
a) Fabricate in accordance with SMACNA “HVAC Duct Construction Standards - Metal and
Flexible”, and as indicated on Drawings.
b) Maximum Damper leakage shall comply to Table 6.4.3.4.4 introduced in ASHRAE standard
90.1-2007 “Energy Standard for building except low-rise residential buildings”
c) Dampers shall be provided where required for the proper regulation of the ventilation
systems. In general, the dampers shall be provided in locations as indicated on the drawings
and in locations as follows:
1. In all branches serving more than 3 Nos. supply and return registers.
2. In all branches serving fresh air to spaces
3. In all main fan supply, recirculation and extract ducts
4. In all connections to grille and diffuser plenum boxes
d) Frame shall be constructed from 1.2 mm thick galvanized steel with four corners of the frame
braced or shall be electro galvanized after manufacture.
e) Multi-Blade Damper: Fabricate of opposed blade pattern with maximum blade sizes 200 x
1825 mm. Assemble center and edge crimped blades in prime coated or galvanized frame
channel with suitable hardware.
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f) End Bearings: Except in round ductwork 300 mm and smaller, furnish end bearings. On
multiple blade dampers, furnish oil-impregnated nylon or sintered bronze bearings. Furnish
closed end bearings on ducts having pressure classification over 500 Pa.
g) Splitter Dampers:
1. Material: Same gage as duct to 600 mm size in both dimensions, and two gages heavier
for sizes over 600 mm.
2. Fabricate blades of single thickness sheet metal to streamline shape for low velocity
systems and double thickness sheet metal to streamline shape for high velocity air
systems. Blades shall be secured with continuous hinge or rod.
3. Operator: Minimum 6 mm diameter rod in self aligning, universal joint action, flanged
bushing with set screw.
4. Single Blade Dampers: Fabricate for duct sizes up to 150 mm in height.
h) Quadrants:
1. Furnish locking, indicating quadrant regulators on single and multi-blade dampers.
2. On insulated ducts mount quadrant regulators on standoff mounting brackets, bases, or
adapters.
3. Quadrant shall be with lockable cadmium plated screws, nuts and washers.
4. The quadrant shall be clearly marked "open" and "shut".
5. Where rod lengths exceed 750 mm furnish regulator at both ends.
i) Provide for low velocity air systems, single thickness damper blades. Provide for high velocity
air systems, double thickness, streamline pattern blades. The edges of the blades shall be
folded and left smooth.
j) Blades: airfoil section blades manufactured from galvanized steel of gage as duct to 600 mm
size in both dimensions, and two gages heavier for sizes over 600 mm.(Extruded aluminium
1.0 mm thick)
k) All blades of multi-leaf dampers shall be rigidly fixed to their spindles and inter linked to
ensure that one movement of the operating handle shall move each blade an equal amount
and differential blade movement does not occur.
l) Provide all dampers with external indication of blade position.
m) Dampers shall be rigid in construction and free from vibration in any position. Casings shall be
airtight. Dampers shall be accurately installed in relation to their quadrants so as to permit
free movement of 90 degrees.
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n) Standard dampers must always be installed with the blade axles horizontal.
o) A constant airflow device is to be provided on the supply and extract ducts serving each
guestroom, and on the branch supply ducts to corridors, to allow the air systems to be
automatically balanced
p) A constant airflow device, such as Trox Model VFL or American Aldes Model CAR, is to be
provided on the supply and extract ducts serving each guestroom, and on the branch supply
ducts to corridors, to allow the air systems to be automatically balanced.
2.7 FLEXIBLE DUCT CONNECTIONS
a) Fabricate in accordance with SMACNA “HVAC Duct Construction Standards - Metal and
Flexible”, and as indicated on Drawings.
b) Connector: Fabric crimped into metal edging strip.
1. Fabric: Fire-retardant neoprene coated woven glass fiber fabric conforming to NFPA
90A, minimum density 1.0 kg/m2.
2. Net Fabric Width: Approximately 150 mm wide.
3. Metal: 75 mm wide, 24 gage (0.6 mm thick) galvanized steel.
2.8 DUCT TEST HOLES
Permanent Test Holes: Factory fabricated, air tight flanged fittings with screw cap. Furnish
extended neck fittings to clear insulation.
3 EXECUTION
3.1 EXAMINATION
a) Verify rated walls are ready for fire damper installation.
b) Verify ducts and equipment installations are ready for accessories.
c) Check location of air outlets and inlets and make necessary adjustments in position to
conform to architectural features, symmetry, and lighting arrangement.
3.2 INSTALLATION.
a) Install in accordance with NFPA 90A, and follow SMACNA “HVAC Duct Construction Standards
- Metal and Flexible”.
b) Install back-draft dampers on exhaust fans or exhaust ducts nearest to outside and where
indicated on Drawings.
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c) Install duct access doors for inspection and cleaning before and after filters, coils, fans,
automatic dampers, at fire dampers, combination fire and smoke dampers, and as indicated
on Drawings. Install at locations for cleaning kitchen exhaust ductwork in accordance with
NFPA 96. Install minimum 200 x 200 mm size for hand access, 450 x 450 mm size for shoulder
access, and as indicated on Drawings. Review locations prior to fabrication.
d) Install permanent duct test holes where indicated on Drawings and required for testing and
balancing purposes.
e) Provide fire dampers, combination fire and smoke dampers and smoke dampers at locations
as indicated on Drawings. Install with required perimeter mounting angles, sleeves,
breakaway duct connections, corrosion resistant springs, bearings, bushings and hinges.
f) Install smoke dampers and combination smoke and fire dampers in accordance with latest
edition of NFPA 92A and NFPA 92B.
3.3 DEMONSTRATION
Demonstrate re-setting of fire dampers to the engineer and owner's representatives. Time of
demonstration shall be coordinated with both the engineer and the owner.
END OF SECTION
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