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SUBURBAN SHEET METAL LTDMailing AddressP.O. Box 739Kennedale, TX 76060Physical Address528 S. Eden Rd.Kennedale, TX 76060Phone (817)478-0801Fax (817)483-6571Duct Fabrication Specifications&Duct ConstructionPage 1 of 43

SUBURBAN SHEET METAL LTDMailing AddressP.O. Box 739Kennedale, TX 76060Physical Address528 S. Eden Rd.Kennedale, TX 76060Phone (817)478-0801Fax (817)483-6571TABLE 1-1PRESSURE CLASSIFICATIONFOR DUCTWORKSTATICPRESSURE CLASS(INCHES (Pa) W.G.) 1/2”-1/2” 1”-1” 2”-2” 3”-3” 4”-4” 6”-6” 10”-10”Rectangular StyleAASTDSTDSTVAAAAAAAAASTVSTDAAAARound StyleSTDFlat Oval StyleFlexible StyleAASTDSTDSTVAAASTVAAANOTES FOR TABLE 1-1:1. “STD” denotes standard (nonvariable volume) airduct construction requirements (regardless of actualvelocity level) for compliance with this documentfor all cases in which the designer does notdesignate the pressure classification for the ductsystem independent of fan static rating. “STV”denotes the standard construction classification forvariable volume ducts for compliance with thisdocument when the designer does not designate aclass for this application.See S1.4 on Page 1-8.2. “A” denotes other pressure classes for whichconstruction or installation details are given in thisdocument and are AVAILABLE for designation incontract documents prepared by designers.3. See Section S1.9 for sealing requirements related toduct pressure class.4. The pressure class number in Tables 1-1 and 1-1Sdenotes construction suitable for a maximum levelnot less than the maximum operating pressure inthe portion of the system receiving theclassification from the designer.Text references for ducts:a)b)c)d)e)ATABLE 1-1SSTATIC PRESSUREDuct Pressure ClassOperating Pressure(in.)(Pa)½” w.g.125Up to ½” w.g.1” w.g.250Over ½” up to 1” w.g.2” w.g.500Over 1” up to 2” w.g.3” w.g.750Over 2” up to 3” w.g.4” w.g.1000Over 3” up to 4” w.g.6” w.g.1500Over 4” up to 6” w.g.10” w.g.2500Over 6” up to 10” w.g.5. Designer selection of duct construction pressureclass is acknowledgment of acceptable designvelocity level and pressure level including anyoverpressure or underpressure conditions that mayoccur during normal and special modes ofoperation.6. The designation of a pressure class pertains tostraight duct and duct fittings except for equipmentand special components inserted into the ductworksystems; such items are governed by separatespecifications in the contract documents.Rectangular .page 1-12Round .page 3-2Flat oval .page 3-13Flexible .page 3-15Duct liner .page 2-24Page 2 of 43

SUBURBAN SHEET METAL LTDMailing AddressP.O. Box 739Kennedale, TX 76060Physical Address528 S. Eden Rd.Kennedale, TX 76060Phone (817)478-0801Fax (817)483-6571The numerical value of the anticipated operatingpressure involves risk.PRECAUTIONS FOR TABLE 1-1:1. The construction is, as indicated elsewhere in thismanual, qualified by freedom from structuralfailure; however, accidental overpressure that couldoccur must be provided for at the design stage byoverpressure relief (such as fail sage features,replaceable relief panels, controlled failure points,etc.)2. Field tests (if ever used) to test structural adequacyshould not exceed 125% of rated pressure. Theassignment of a pressure class number less than3. Leakage test pressure should not exceed ductpressure class level.4. Short-cycle pressure changes in duct systems cancause temporary noise. This is normally acceptableat system start-up and shutdown. To reduce oreliminate this noise, the designer must specifyshorter-interval bracing, diagonal bracing, lagging,or other control means.Page 3 of 43

SUBURBAN SHEET METAL LTDMailing AddressP.O. Box 739Kennedale, TX 76060Physical Address528 S. Eden Rd.Kennedale, TX 76060Phone (817)478-0801Fax (817)483-6571Duct Sealing Requirements Table 1-2Seal ClassSealing RequiredStatic PressureConstruction ClassAAll Transverse JointsLongitudinal Seams andDuct Wall Penetrations4”W.G. AND UPBAll Transverse Joint andLongitudinal Seams3”W.G.CTransverse Joints2”W.G.IN ADDITION TO THE ABOVE, ANY VARIABLE AIR VOLUME SYSTEM DUCT OF1½”W.G. CONSTRUCTION CLASS THAT IS UPSTREAM OF THE VAV BOXES SHALLALSO MEET SEAL CLASS C.Page 4 of 43

SUBURBAN SHEET METAL LTDMailing AddressP.O. Box 739Kennedale, TX 76060Physical Address528 S. Eden Rd.Kennedale, TX 76060Phone (817)478-0801Fax (817)483-6571SHEET METAL STANDARDSDUCTDIMENSIONSDUCT GUAGE AND ENFORCING FOR 1” ESS & DRIVE ( /-)GAUGE OF METAL5’4’2.5’2’JOINTJOINT -up18182626242422 no Cnt.ref22 no Cnt.ref20 no Cnt.ref2626262422 noCnt. ref22 noCnt. Ref20 noCnt. refREINFORCINGFLAT ESSES & DRIVE1”st ESSES & DRIVE1”st ESSES & DRIVE1”st ESSES & DRIVETDFNONENONENONENONENONETDF CNT-JNTNONETDF CNT-JNT 48” MAXSPACING1 ½ WIDE X 1 ½HIGH 18GA VTYPESTIFFENERNOTES: 1. TDC DUCT CONSTRUCTED PER SMACNA STANDARDS-FIRST EDITION 19952. DUCT FABRICATED USING SNAPLOCK SEAMS.3. ALL DUCT STIFFENED BY MACHINE FORMED BEADS SPACED AT 12” O.C.4. DUCT WORK TO BE SEALED PER SMACNA HVAC TABLE 1-25. TDC CNT-JNT-CONDU-LOC @ TDC CONNECTOR CENTER OF DUCT & @ TDC CONNECTORPage 5 of 43

SUBURBAN SHEET METAL LTDMailing AddressP.O. Box 739Kennedale, TX 76060Physical Address528 S. Eden Rd.Kennedale, TX 76060Phone (817)478-0801Fax (817)483-6571SHEET METAL STANDARDSDUCT GUAGE AND ENFORCING FOR 1” ESS & DRIVE ( /-) HEAVY GA METALGAUGE OF ONS JOINT -up18182624222020 no Cnt.ref20 no Cnt.ref20 no Cnt.ref2624222020 noCnt. ref20 noCnt. Ref20 noCnt. refFLAT ESSES & DRIVE1”st ESSES & DRIVE1”st ESSES & DRIVE1”st ESSES & DRIVETDFNONENONENONENONENONETDFNONETDF CNT-JNT 48” MAXSPACING1 ½ WIDE X 1 ½HIGH 18GA VTYPESTIFFENERNOTES: 1. TDC DUCT CONSTRUCTED PER SMACNA STANDARDS-FIRST EDITION 19952. DUCT FABRICATED USING PITTSBURG SEAMS.3. ALL DUCT STIFFENED BY MACHINE FORMED BEADS SPACED AT 12” O.C.4. DUCT WORK TO BE SEALED PER SMACNA HVAC TABLE 1-25. TDC CNT-JNT-CONDU-LOC @ TDC CONNECTOR CENTER OF DUCT & @ TDC CONNECTORPage 6 of 43

SUBURBAN SHEET METAL LTDMailing AddressP.O. Box 739Kennedale, TX 76060Physical Address528 S. Eden Rd.Kennedale, TX 76060Phone (817)478-0801Fax (817)483-6571SHEET METAL STANDARDSDUCTDIMENSIONSDUCT GUAGE AND ENFORCING FOR 1” W. G. ( /-) TDFGAUGE OF METAL5’4’2.5’2’JOINTJOINT -up18182626242422 no Cnt.ref22 no Cnt.ref20 no Cnt.ref2626262422 noCnt. ref22 noCnt. Ref20 noCnt. refREINFORCINGHEMMED “S” & DRIVETDFTDFTDFTDF CNT-JNTNONENONENONENONENONETDF CNT-JNTNONETDF CNT-JNT 48” MAXSPACING1 ½ WIDE X 1 ½HIGH 18GA VTYPESTIFFENERNOTES: 1. TDC DUCT CONSTRUCTED PER SMACNA STANDARDS-FIRST EDITION 19952. DUCT FABRICATED USING PITTSBURG SEAMS.3. ALL DUCT STIFFENED BY MACHINE FORMED BEADS SPACED AT 12” O.C.4. DUCT WORK TO BE SEALED PER SMACNA HVAC TABLE 1-25. TDC CNT-JNT-CONDU-LOC @ TDC CONNECTOR CENTER OF DUCT & @ TDC CONNECTORPage 7 of 43

SUBURBAN SHEET METAL LTDMailing AddressP.O. Box 739Kennedale, TX 76060Physical Address528 S. Eden Rd.Kennedale, TX 76060Phone (817)478-0801Fax (817)483-6571SHEET METAL STANDARDSDUCTDIMENSIONSDUCT GUAGE AND ENFORCING FOR 2” W. G. ( /-)GAUGE OF METAL5’4’2.5’2’JOINTJOINT JOINT JOINT 626262424HEMMED “S” & DRIVETDFTDFTDFTDFTDF49-54222224 noCnt. ref24 noCnt. refTDF CNT-JNT55-60”222222 noCnt. ref22 noCnt. refTDF CNT-JNT61-84”222222 noCnt. ref22 noCnt. refTDF CNT-JNT85-96”202020 noCnt. ref20 noCnt. refTDF CNT-JNT97-up181818 noCnt. ref18 noCnt. refTDF CNT-JNTREINFORCINGNONENONENONENONENONENONE1 ½ WIDE X 1 ½HIGH 18GA VTYPE STIFFENER1 ½ WIDE X 1 ½HIGH 18GA VTYPE STIFFENER1 ½ WIDE X 1 ½HIGH 18GA VTYPE STIFFENER1 ½ WIDE X 1 ½HIGH 18GA VTYPE STIFFENER1 ½ WIDE X 1 ½HIGH 16GA VTYPE STIFFENERNOTES: 1. TDC DUCT CONSTRUCTED PER SMACNA STANDARDS-FIRST EDITION 19952. DUCT FABRICATED USING PITTSBURG SEAMS.3. ALL DUCT STIFFENED BY MACHINE FORMED BEADS SPACED AT 12” O.C.4. DUCT WORK TO BE SEALED PER SMACNA HVAC TABLE 1-25. TDC CNT-JNT-CONDU-LOC @ TDC CONNECTOR CENTER OF DUCT & @ TDC CONNECTORPage 8 of 43

SUBURBAN SHEET METAL LTDMailing AddressP.O. Box 739Kennedale, TX 76060Physical Address528 S. Eden Rd.Kennedale, TX 76060Phone (817)478-0801Fax (817)483-6571SHEET METAL STANDARDSDUCTDIMENSIONSDUCT GUAGE AND ENFORCING FOR 3” W. G. ( /-)GAUGE OF METAL5’4’2.5’2’JOINTJOINT JOINT JOINT JOINTCONSTRUCTIONREINFORCING0-12”24242424HEMMED “S” & FNONE31-42”20222424TDFNONE43-48”242424 noCnt. ref24 noCnt. refTDF49-60”222224 noCnt. ref24 noCnt. refTDF CNT-JNT61-72”222222 noCnt. ref22 noCnt. refTDF CNT-JNT73-84”202020 noCnt. ref20 noCnt. refTDF CNT-JNT85-96”181818 noCnt. ref20 noCnt. refTDF CNT-JNT97-up181818 noCnt. ref18 noCnt. refTDF CNT-JNT 48” MAXSPACING1 ½ WIDE X 1 ½HIGH 18GA VTYPE STIFFENER1 ½ WIDE X 1 ½HIGH 18GA VTYPE STIFFENER1 ½ WIDE X 1 ½HIGH 18GA VTYPE STIFFENER1 ½ WIDE X 1 ½HIGH 18GA VTYPE STIFFENER1 ½ WIDE X 1 ½HIGH 18GA VTYPE STIFFENER1 ½ WIDE X 1 ½HIGH 16GA VTYPE STIFFENERNOTES: 1. TDC DUCT CONSTRUCTED PER SMACNA STANDARDS-FIRST EDITION 19952. DUCT FABRICATED USING PITTSBURG SEAMS.3. ALL DUCT STIFFENED BY MACHINE FORMED BEADS SPACED AT 12” O.C.4. DUCT WORK TO BE SEALED PER SMACNA HVAC TABLE 1-25. TDC CNT-JNT-CONDU-LOC @ TDC CONNECTOR CENTER OF DUCT & @ TDC CONNECTORPage 9 of 43

SUBURBAN SHEET METAL LTDMailing AddressP.O. Box 739Kennedale, TX 76060Physical Address528 S. Eden Rd.Kennedale, TX 76060Phone (817)478-0801Fax (817)483-6571SHEET METAL STANDARDSDUCTDIMENSIONSDUCT GUAGE AND ENFORCING FOR 4” W. G. ( /-)GAUGE OF METAL5’4’2.5’2’JOINTJOINT JOINT JOINT JOINTCONSTRUCTIONREINFORCING0-8”24242424HEMMED “S” & NONE31-36”20222424TDFNONE37-42”242424 noCnt. ref24 noCnt. refTDF43-48”222222 noCnt. ref22 noCnt. refTDF CNT-JNT49-60”222222 noCnt. ref22 noCnt. refTDF CNT-JNT61-72”202020 noCnt. ref20 noCnt. refTDF CNT-JNT73-84”181818 noCnt. ref20 noCnt. refTDF CNT-JNT85-96”20 2SETSCnt. ref202020 noCnt. refTDF CNT-JNT97-up181818 noCnt. ref18 noCnt. refTDF CNT-JNT 48” MAXSPACING1 ½ WIDE X 1 ½HIGH 18GA VTYPE STIFFENER1 ½ WIDE X 1 ½HIGH 18GA VTYPE STIFFENER1 ½ WIDE X 1 ½HIGH 18GA VTYPE STIFFENER1 ½ WIDE X 1 ½HIGH 18GA VTYPE STIFFENER1 ½ WIDE X 1 ½HIGH 18GA VTYPE STIFFENER1 ½ WIDE X 1 ½HIGH 16GA VTYPE STIFFENER1 ½ WIDE X 1 ½HIGH 16GA VTYPE STIFFENERNOTES: 1. TDC DUCT CONSTRUCTED PER SMACNA STANDARDS-FIRST EDITION 19952. DUCT FABRICATED USING PITTSBURG SEAMS.3. ALL DUCT STIFFENED BY MACHINE FORMED BEADS SPACED AT 12” O.C.4. DUCT WORK TO BE SEALED PER SMACNA HVAC TABLE 1-25. TDC CNT-JNT-CONDU-LOC @ TDC CONNECTOR CENTER OF DUCT & @ TDC CONNECTORPage 10 of 43

SUBURBAN SHEET METAL LTDMailing AddressP.O. Box 739Kennedale, TX 76060Physical Address528 S. Eden Rd.Kennedale, TX 76060Phone (817)478-0801Fax (817)483-6571SHEET METAL STANDARDSDUCTDIMENSIONSDUCT GUAGE AND ENFORCING FOR 6” W. G. ( /-)GAUGE OF METAL5’4’2.5’2’JOINTJOINT JOINT JOINT JOINTCONSTRUCTIONREINFORCING0-8”24242424HEMMED “S” & 24 noCnt. ref24 noCnt. refTDF37-42”222222 noCnt. ref22 noCnt. refTDF43-48”202020 noCnt. ref20 noCnt. refTDF49-60”202020 noCnt. ref22 noCnt. refTDF CNT-JNT61-72”181818 noCnt.ref20 noCnt. refTDF CNT-JNT181820 noCnt. refTDF CNT-JNT 48” MAXSPACING181818 noCnt. RefTDF CNT-JNT 48” MAXSPACINGNONENONENONE1 ½ WIDE X 1 ½HIGH 18GA VTYPE STIFFENER1 ½ WIDE X 1 ½HIGH 18GA VTYPE STIFFENER1 ½ WIDE X 1 ½HIGH 18GA VTYPE STIFFENER1 ½ WIDE X 1 ½HIGH 18GA VTYPE STIFFENER1 ½ WIDE X 1 ½HIGH 18GA VTYPE STIFFENER1 ½ WIDE X 1 ½HIGH 16GA VTYPE STIFFENER1 ½ WIDE X 1 ½HIGH 16GA VTYPE STIFFENER73-96”97-up18 2SETSCnt. ref18 2SETSCnt.refNOTES: 1. TDC DUCT CONSTRUCTED PER SMACNA STANDARDS-FIRST EDITION 19952. DUCT FABRICATED USING PITTSBURG SEAMS.3. ALL DUCT STIFFENED BY MACHINE FORMED BEADS SPACED AT 12” O.C.4. DUCT WORK TO BE SEALED PER SMACNA HVAC TABLE 1-25. TDC CNT-JNT-CONDU-LOC @ TDC CONNECTOR CENTER OF DUCT & @ TDC CONNECTORPage 11 of 43