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Duct Construction PDF

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Yared Abebe
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339 views32 pages

Duct Construction PDF

Uploaded by

Yared Abebe
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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DUCT CONSTRUCTION All ductwork will be built to SMACNA guidelines A\ll ductwork will be built out of G-90 coated galvanized steel of lockforming grade conforming to ASTM Standards A-525 and A-527, unless otherwise specified. Duct sides that are 19” and over are 20 gauge or less, with more than 10sq. Ft. of unbraced panel area shall be beaded 12” on center as in fig. 1-8, page 1-45 of SMACNA HVAC Duct Construction. All longitudinal seam will be Pittsburgh seam. (Type L-1) Fig. 1-5 Page 1-40 SMACNA HVAC Duct Construction. Also on large duct we may use standing seams for stiffness and seam. Transverse joint reinforcement will be: Class A connection Flat Drive Table 1-18 pg. 1-43 Class B & C connection Standing $ T-10 Table 1-11 pg. 1-24 Class D connection ‘TDC ot Ward Flange see insert Class E connection ‘TDC ot Ward Flange see insert Class F connection ‘TDC or Ward Flange see insert Class G connection ‘TDC or Ward Flange see insert Class H-J K connection ‘TDC or Ward Flange see insert ] + Pocket depth from % in. to % in + Use on straight duct and fittings PosK at cus * Tox 10 in. w ST yin Genin Seams cee PITTSBURGH LOCK Kish oe - e © % in, pocket depth for 20, 22, and 24 ga + "Ain, pocket depth for 24 and 26 ga + Tos4in we + Screws must be added atthe ends ofall duet of 4 in, wg and at the ends of 3 in. wg when the duct is over 48 in, width Le BUTTON PUNGH SNAP LOCK Ls GROOVED SEAM [ALSO CALLED FLAT LOCK AND PIPE LOCK + To 10in. we + Lin, seam up to duct width of 42 in, +1 ¥4in, seam for larger ducts + May be used on duet interiors + Fasten at 2 in, maximum from ends and at 8 in. | ‘maximum intervals L-ASTANDING SEAM © Tot 10in. wg | * Fasten as per L-# L-SSINGLE CORNER SEAM 2.10 + TF _ 7 Ratings may be adused with BLrated bar stock 4 ‘or members from Tables 2-29 and 2-30 | ‘Supplemental members may be attached to the ‘+ Assemble per Figure 2-17 = dduct wall on both sides of the joint FLANGED FLANGED ie ae + Single members may be used if they are fastened S50 oa through both mating flanges THe. + Gasket o be located to form an effective seal) FIGURE 2-2 RECTANGULAR DUCT/LONGITUDINAL SEAMS HVAC Duct Construction Standards Meta nd Fexbie » Third Eaton RRR) @ Relat ee ancpaa to | Tat ta | | Td Class slip mm Standing S Standing S Standing S Standing S a Pa (wr orev a - | LWT er) uxt SE] uxt LE) ux uxt YT arse oot asec focal) career LR Tie LF LF A [oa [Us [ues | Qs [ues | [ued | B | 10 [rmx26g | 04 |1x26e | 06 J 06 [1x26e | 07 Clio [ae [os [es Oa [ieee | 08 : r Tiox20 120 Too lan xe Txt ga > | 27 tex 18a Tepe) [09 [Pay | 09 [oar | te inka 4 5 | Txt | 6s | ise | 10 [rxiseae | 10 | 1} 12 |uer | : Vox 18 [ase | 10 | iaseabes | | Tia aa F | al UseG | Uses eral | xis | 13 | T1hx20 | G | 158 [riexiser | 13 vaxise [13 isbn | 1 | ut | | [ecie | 28 1 NOT GIVEN - at | i 214x208 1| 6 eel axaxk | 29 | || Angle NOT GIVEN NOTGIVEN [3ydbge 3 | 80 2x2x%e | 37 | Angle a | | NOTGIVEN Table 2-31 Transverse Joint Reinforcement ‘See Section 2.1.4. *Effectve EI is number listed times 10° before adjustment for bending moment capacity. 2 and To10 through T-14 are restricted to 30 in. length at4 in, we, to 36 in. length at 3 in. wg and are not recommended for service above 4 in. wg. (+) indicates positive pressure use only 2.74 HVAC Duct Construction Standards Metal and Flexible Third Edition 4 J h foie ese | eS, Lk | Bee Wei 1 te T-25a A i Flanged a T GASKET = 1% in een ‘GASKET | qwiTH GASKET) (uu) f= 1 in. wii eaeve 7-22 ‘i ‘7-24 T-24a ‘T-25b ‘Slip-On Reinf. Companion Class. ‘Angles Flanged Flanged Flanged Flange wr wr] uxt Lt | uxt [WT Be eT ae [78™ Pie | oom) or] om) ar B [10 [Uee Use D Used UseD © [19 [Ure UseD UseD UseD D [27 [Use 26m [05 [ixazm | 04 [26g | 05 | Cott mamfacr E | 65 |Cixh 17 | 24 ga 0.6 | Use F 24ga - | 0.6 | turers for ed by per- F | 128 |HIx% 17 [22 ga 0.7 [1x20 ga] 0.6 ae 07 —— ee 2ea®) 2 3) mented to fune- G | 158 | Mex 21 |50G 10 |1%x 18 ga] 08 20 ga 10 tonal eriteria in hx! Chapter 11. See | 264 [CUES O | 26 lige | 1a te | 1 | wtSi ie pee C| @ [mxn 37 [20e@) | 10 2a ® | 10 Texh SEE TIE ROD 5} 90 ee 47 [8m® | TEXT Ba® | 11 K | 103 |2x%e 5 [18 a® | 11 1 g~@® {11 L | 207 |H2x% 65 |18g®) | 1 Ba@® | it use only. 2.76 Table 2-32 Transverse Joint Reinforcement ‘See Section 2.1.4, *Efective El is number listed times 10° before adjustment for bending moment capacity. For T-22, ‘ee tie rod downsize options in Tables 2-1 to 2-7; one rod for two angles. (R) means Tie Rodded. Accepted Pressure Mode for T-24a is (+) or (-)2 in. wg maximum. See Figures 2-5 and 2-6 and tie rod text. (+) indicates positive pressure HVAC Duct Construction Standards Metal and Flexible » Third Edition SED Joint ALTERNATE FLANGE STYLE. The joint may be formed without the 4" (9.5 mm) flange if the duct is held Je" (3.2 mm) back from the vertical face of thé angle and tackwolded to the flange along the edge of the duct. The angle is otherwise fastened normally. For additional tightness, place sealant between the angle and duct or seal the weld Ifthe faces of flanges are flush, thick-consistency sealant may be used in lieu of gasket. Otherwise, use a gasket suitable for the specific service and fit it up uniformly to avoid its protruding inside the duct Joint 1-24, FORMED FLANGE: Mating flanges are formed on the ends of the duct in double flange style to create a tee shape when assembled. A minimum of 16 gage (1.61 mm) thickness steel ‘comer pieces with %" (9.5mm) minimum diame- ter bolts shall be used to close comers. 4" (6.4mm) by %" (13 mm) minimum gaskets of suit- able density and resiliency shall be continuous around the joint and shall be located to form anef- fective seal. Mating flanges shall be locked to- gether by 6" (152 mm) long clips located within 6* (152 mm) of each comer. Clips shall also be spaced at centers notexceeding 15" (381 mm) for 3" wa (750 Pa) or lower static pressure, and not exceeding 12" (305 mm) for 4" (1000 Pa), 6" (1500 Pa), and 10" (2500 Pa) wg Flanges may also be assembled per Figure 1-15. it T-24a. This is a modified version of T-24 that is assembled per Figure 1-15. Unless supplemental reinforcements are incorporated itis limited to 2" ‘we (500 Pa) maximum service. Joints T-25aand T-25b. These systems are also known 1.64 bythe tradenames TDC® and TDF®, respective- ly. Assembly specifications are given in Figure 1-15, Ratings in Table 1-12 may be adjusted when combined with El rated flat bar stock or members from Table 1-10. The supplemental reinforce- ‘ments may be attached to the duct wall on both sides ofthe joint oruse single members ifsuch are fastened through both mating flanges. ‘See Figure 1-44 fora commentary on proprietary joint systems, and see Chapter VII for joint performance evaluation, See Tables I-11, 1-12, and T-13 for additional joint specifications. ‘See Figure 1-11 for attachment of joint backup rein- forcements to the duct, See Figures 1-2 and 1-3 for use of tie rods. ‘See Figures 1-13 through 1-16 for comer closures at joints 1.45 COMMENTS ‘There are several proprietary duct connection systems available and in use. Because such systems are propri- etary or have proprietary elements, SMACNA does not evaluate or grade them. However, SMACNA does encourage the developmentand use of new technology and it invites authorities to consider alternative constructions. Authorities may evaluate alternatives using analyses and tests suchas those described in Sec- tion VII of the standards or using other means they deem appropriate. Consult the manufacturers of alter- native systems for ratings, assembly requirements and recommendations, Note that joints previously shown in eatlier editions can still be used. T-4, 9, 17, 18, 19, 20, nd 23, omitted due to infrequent use, may still beused per the firstedi- tion if acceptable to the specifying authority. HVAC Duct Construction Standards Metal and Flexible - Second Edition @MAGHA) ( i] ( ( 9 Manne neeneeneemeeeeeeameereenrnnnn= Duct Connection Products ‘echnical Product Infor WARD wousies Flange + Available in specialty metals + Provides a large butyi-filled integrated sealant pocket to ensure proper sealing + Offers a metal shoulder to protect gasket + Available in 10' and 20' lengths + Recommended for 14-gauge through 26-gauge ductwork Model FLG J Model FLGH st ated Flange Hea ted Flange :2 O-gauge galvanizes steel “2 2-gaugo gawvanizod stool eels SMACNA rigidity Class J for «fe els SMACNA rigidly Class H transverse joints (stee!) for transverse joints (steel) ‘Me ots SMACNA rigidly Class H for transverse joints (aluminum) Model Q FLG J QUICK FLANGE ” Model QFLG H QUICK FLANGE * sr ated Flange Hira ted Flange 12 O-gauge galvanized steet "2 2-gauge galvanized stool sMe_els SMACNA rigidity Class J for SMe els SMACNA rigidity Class H transverse joints (steel) for transverse joints (steel) ‘Me eis SMACNA rigidity Class H for transverse joints (aluminum) eed Duct Connection Products ee) WARD sess Corner + Formed galvanized steel + Available in specialty metals to match flange material nee | S f ey i, Se eee 2 1 SFtrge Comer w Nronge omer ean ret Nuts and bolts included (galvanized) + Nuts andboltsincuded galvanized) | [DEFNES COME a is Model CNR TF Model CNR cc + TOF Flange Comer = Comermatic TDC FlangeComer ‘Model CNR. CF + Use with TOF-formed flange + t6gauge + Comermatc TDF Flange Comor + Use with Comermatic + 16-geuge corner injection machines + Use with Comermatic comer injection machines Cleat + Formed galvanized steel + Available in specialty metals to match flange material + Available in 10' or 6" lengths + Available in .070" thick extruded PVC for breakaway connections (6" only) Model CLT W ‘ Model CLT F + WCleat ty + F Cleat + Use with Ward J and H + Use with TOF-formed flange, as wellas TOC- flange formed flange » VERSA-CLEAT ‘Snap-On Cleat Can be used in conjunction with a variety of TOC connections along with Ductmate 645i, Onieten | —cuantiy | UorFowt [woah won| Harem | Bes CN eS SS Galvanized Galvanneal PVC Coated 316 Stainless Aluminized All measurements are inside dimensions Manufactured from 22 Gauge MANUFACTURED BY: DUCTMATE. Industries, Inc. WARD oe Duct Connection Products Technical Product Information Butyl Gasket + Provides a nondrying, permanently flexible gasket + Adheres to a variety of clean, dry surfaces + Contains high percentage of virgin butyl rubber to enhance its sealing and aging characteristics + Formulated to retain handling properties through a wide temperature range + Will not crack or separate while being applied at low temperatures + Product is UL-listed Model GSK-BT Butyl Tape Gasket Model GSK-BP Buty! Patch Gasket + Product is 9/16" x 5/8" and is available + Product is 3/16" thick, and is available in 30' rolls In 1" x 2" and 2" x 3" patch sizes + Product is 3/16" x 5/8" and is avaliable in 28' rolls Neoprene Tape Gasket + Closed-cell foam comprised of neoprene, PVC, and nitrile + Has good chemical resistance and is flame-rated + Product is 5/16" x 3/4", and is available in 50' rolls + Product is UL-listed Model GSK-NT. Penn tc een rar in. we Static 7 Reinforcement Code for Duct Gage Number Pos: OF NeB: |p einforcement - ot Required Reinforcement Spacing Options Dimension ion | a | 6R | sR | 4h | 3R [MAL OR © ® ®}|O}|O}|O/® ®/© 10m and under | 26 ga. 1-22 in 26 ga. B= 14m 26 a8 Not Required 15— 16in 26 ga. 17=18in 26 a 19-20, 24ga. | B26 | B26 | B26 | B26 | BIS | BIS | ADS | ADS 21-2in. 2g. | B26 | B26 | B26 | B26 | B26 | B26 | B26 | ADE 23-24 in, mga | C26 | 026 | C26 | B26 | B26 | B26 | B26 | BIE 25-26in. 20. | C26 | C26 | c26 | c26 | B26 | B26 | B26 | B26 27-28 in, 18 gn 2s [C26 | C26 | C26 | C26 | B26 | B26 | B26 29 30a Wea | C24 | C26 | c26 | C26 | C26 | B26 | B26 | B26 31-36 in, Ween [p22 | p24 | C26 | C26 | C26 | C26 | 026 | B26 37= in, Wea | £20 | E24 | p26 | 26 | C26 | C26 | c26 | 026 Bain. Wea | £20 | Ex | B26 | £26 | D26 | D26 | C26 | C26 054i Fis | F20 | £22 | £26 | £26 | E26 | D26 | c26 35 60'in Gis [20 | Fa | B26 | E24 | £26 | B26 | 26 61- Tin. His [Wis | F20 | P22 | P24 | B24 | B24 | Bz 73—B4in_| Not Designed 1166 [H-18G |H22G | G24 | 24 | Fae] P24 35-96in. 1166 | 1186 | H-206 | #226 | G22 | P22 | P22 97-~108 in. 1166 | 1186 | F186 | #-i8G | W186 | Gas 109-120 in. 7166 [F166 [1186 [W-186 | i8G Table 2-1 Rectangular Duct Reinforcement aaa ' HVAC Duet Construction Standards Metal and Flexible « Third Edition Roary ‘aac / Reinforcement Code for Duct Gage Number Pos. of NEE _| patntoreement = Required Reinforcement Spacing Options Dimension won [se [or [ se | ae [ 3n [2a | 28 © @ ©1©|O|O/O/O/O/@ - = 14" have two locks, (Cad models with Bc 14° have two lcs, doors with Bo-14" have four locks, + Outside frame size fs hole 1" smalior than door siza, + Minimum size is 6'w x4", Maximum sire is 24°w x247h OPTIONS 22 Gauge gatvanized steal doo: = Closed cell nsoprene gasket a Evtra tock: Q ‘Stainless steel construction: oes 316 a Vertlock #100 tate: o ‘See-thru door panel: HaDeOs «O casos «=O 1 flanged frame: o a Rov. 3-19.93 ‘POTTORFF COMPANY INC. 700 SOUTH VAIL AVENUE MONTEBELLO, CA 80640 (21) 728-0004 TOTAL P.01 SUBMITTAL RECORD os LOCATION SuBMITTEDTO ‘SUBMITTAL PREPARED BY APPROVED BY bare DESCRIPTION All ait duct installations for heating, cooling or ventilation are attached to mechanical equipment containing a tan or blower. Vibrations, noises and rattles resulting from operation of the fan or blower are transmitted into the metal ducts which carry the noises throughaut the system. In order to isolate the vibration and noises to the source, an. air-tight flexible joint, consisting ofa fabric which is attached to sheet metal on both sides, must be inserted between the equip ment and the ductwork: This vibration isolator is called a “Flexible Duct Connector © DYNE Specification Form DDFDC-1190 Flexible Duct Connector RELATED NFPA 90A & 908 STANDARDS 2.1.2 Vitraton ication connects in dct systems shat te mage olan aporoved are retardant ae or Sal anit {slave nis with packing approved mate Navng a Mame spread rating of nok over 25 ano a eke Geveapment ling of nt aer 39. Vibrato solaton connectors consicted St Tae Shall rat exceed 0 nc neh NFPA No, 9A ‘98 2-41 exe. no 3 Vitaton slation connectors in eet system shall be made ofan approved ame relat fase of shat fons! of seve Janis wih packing ot appowed non fomcustkie mated. Vibration ‘spain conacrs con Struts at itn sal not exceed 10 mens i length NFPA Wo. 808 180, (CO “METAL-FAB” ‘S"fabrie—3" metal € sean 'Gip Los METAL “SUPER METAL-FAB” wie Gauge: 24 Dimensions! 3" metal— ‘8° fabric—3° metal ‘seam: "Grip Loe to METAL FABRIC COMPARISONS Y Excelon JIM CINeoprene —Durolon A insulllex CO Thermatab Continuous Temp. Range “sor io ior Jat wo m0 ——25F WOE —— AF WEE THEW SOE Color : Black fac White ack Geen Weight Per Sq. Yd. 2 ff» 2428 (Composite Weight) 17 Abrasion Resistance 1 15,000 cyces [MMI SOO cjces S00 cytes 500 oles 125 cycles Leakage Resistance 2 260 _ 35 2 125 165 Minimum Radiation Resistance of Fabric 3.19 x w= 56 x 108 19 08 19 x 108 ox Tear Strength sooo ‘| ware ‘aie an 719 “Tensile Strength 5 2anr220 007450 725/300 70/70 12518 High Tex Seng General Purpose. Ever Ozone and Low Smoke Emson Vy Low Sake Featires High Abrasion oe Weathering insulted Emission High Resistance Resistance, 94-9 Coniguatn, "Temperature Best cera id asst E Resistance eee Codes, WetarFab MBX (10759) MEN (#70008) MFO (#10002) TOC (#0173) ‘MFT (#10006) Super etek Fab Und (e160 MM MFONGrtO0%2) FeO (007) mre (0013) —_ 1. Abrasion resistance as pe Federal Test Sandor 191 Meta #5906 using CS 17 wheel wth 250 Gram is. 2. Leakage resistance as per Feseral Test Standard 191 Meta #5612, esdts In PS. (To Cwatt hes of wala muliply PSI. x 27.176.) 83. Radiation resistance shown is in Rads and represents tne amount of cadation the lbric can wihstang and sl retain 95% os tensle strength 4 Teac tng in tongue pounds as per Federal Test Standre 191 Melod #5138.1/(nap/{0) 5. Tonsie strength i gab pound abot Federal Test Stancard 191 Method #5100 (mer). SUGGESTED SPECIFICATION Vibration tsolating Flexible Duct Connector for Heating, Cooling & Exhaust Supplies & Returns. ‘At the inlet and discharge of all air handling equipment — and a continuous temperature range of Vioration (unless otherwise noted) furnish and install vibration isolators. Isolators shall be preassembled metal to exposed fabric. to bration isolators shall be a coated woven fabric named metal. Fabric and metal shall be joined by means of a double lock seam. Vibration Isolators shall be Code (called Flexible Duct Connectors) as manufactured by Duro Dyne Corporation, Farmingdale, N.Y. and shall be “Underwriters Laboratories Classified Vibration Isolators shall have a Tear Strength of not less than . an abrasion resistance of not less than Feb-17-97 12:20° SHEET METAL CONNECTORS, INC, 112 18th AVENUE NORTHEAST + MINNEAPOLIS, MINNESOTA 55416 Call toll tree 1-800-328-1966 Locally, cali 781-4811 FAX 612-781-2605 Me 2” PUSH TYPE SIDE RAILS MATERIAL (SMC 324), 2" PUSH TYPE SIDE RaiLS Made from 24 GA Galy Stool 2” HOLLOW TURNING VANES (smo 226) Ty DIMPLED SMC 324 €z RAIL ——— STOCK LENGTH 10° 10 PCS PER Box MATERIAL 2° Turning Van Mage from 28 Ga Gah Stent i — US PAT. 2 4.067.829 This NEW E2 rail eliminates any need tor dowels.screws oF nails. Just one sharp rap in the right place does it al! e SMC 226 STOCK LENGTHS 10° GALVANIZED 2" — 10 PCS PER BUNDLE Etvectiva, Base 599 SPIRAL SEAM Tox 10in. wg LAP AND RIVET OR TACK WELD ON 6" (152 mm) INTERVAL, SPOTWELD ON (61 ym) INTERVAL, Le ALS To+4 in. we ‘Acceptable to 10 in. wg if spot welded om 1 in. intervals or tack welded on 3 in. intervals oN 'SNAPLOCK SEAMS + Totl0in.wg BUTT WELD (OR LAP a SEAM WELDED) ALS a * Tot 10in. wg GROQVED seam + To-3inwg PPE LOSK Fla Lock RAO AL-68

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