Ti nker AFB, OK TAFB Techni cal Spr ci f i cat i ons 2019

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METAL DUCTS

PART 1 GENERAL

Sect i on 23 00 00 AI R SUPPLY, DI STRI BUTI ON, VENTI LATI ON, AND EXHAUST SYSTEMS appl y t o wor k speci f i ed i n t hi s sect i on.

Sect i on 23 05 48. 00 40 VI BRATI ON AND SEI SMI C CONTROLS FOR HVAC PI PI NG AND EQUI PMENT appl i es t o wor k i n t hi s sect i on.

Sect i on 40 17 30. 00 40 WELDI NG GENERAL PI PI NG appl i es t o wor k speci f i ed i n t hi s sect i on.

1. 1 REFERENCES

The publ i cat i ons l i s t ed bel ow f or m a par t of t hi s speci f i cat i on t o t he ext ent r ef er enced. The publ i cat i ons ar e r ef er r ed t o wi t hi n t he t ext by t he basi c desi gnat i on onl y.

AMERI CAN I NSTI TUTE OF STEEL CONSTRUCTI ON ( AI SC)

AI SC 325 ( 2011) St eel Const r uct i on Manual

AI SC 360 ( 2010) Speci f i cat i on f or St r uct ur al St eel Buildings

AMERI CAN SOCI ETY OF HEATI NG, REFRI GERATI NG AND AI R- CONDI TI ONI NG

ENGI NEERS ( ASHRAE)

ASHRAE EQUI P I P HDBK ( 2012) Handbook, HVAC Syst ems and Equi pment ( I P Edi t i on)

ASHRAE EQUI P SI HDBK ( 2012) Handbook, HVAC Syst ems and Equi pment ( SI Edi t i on)

ASHRAE FUN I P ( 2013; Addenda and Cor r i gendum 2013) Fundament al s Handbook, I - P Edi t i on

ASHRAE FUN SI ( 2013; Addenda and Cor r i gendum 2013) Fundament al s Handbook, SI Edi t i on

AMERI CAN WELDI NG SOCI ETY ( AWS)

AWS A5. 8/ A5. 8M ( 2011; Amendment 2012) Speci f i cat i on f or Fi l l er Met al s f or Br azi ng and Br aze Wel di ng

ASTM I NTERNATI ONAL ( ASTM)

ASTM A123/ A123M ( 2013) St andar d Speci f i cat i on f or Zi nc ( Hot - Di p Gal vani zed) Coat i ngs on I r on and St eel Pr oduct s

ASTM A36/ A36M ( 2014) St andar d Speci f i cat i on f or Car bon St r uct ur al St eel

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ASTM A653/ A653M ( 2015; E 2016) St andar d Speci f i cat i on f or St eel Sheet , Zi nc- Coat ed ( Gal vani zed) or Zi nc- I r on Al l oy- Coat ed ( Gal vanneal ed) by t he Hot - Di p Pr ocess

ASTM A924/ A924M ( 2016a) St andar d Speci f i cat i on f or Gener al Requi r ement s f or St eel Sheet , Met al l i c- Coat ed by t he Hot - Di p Pr ocess

ASTM C1071 ( 2016) St andar d Speci f i cat i on f or Fi br ous Gl ass Duct Li ni ng I nsul at i on ( Ther mal and Sound Absor bi ng Mat er i al )

ASTM D257 ( 2014) St andar d Test Met hods f or D- C Resi st ance or Conduct ance of I nsul at i ng Materials

ASTM E90 ( 2009) St andar d Test Met hod f or Labor at or y Measur ement of Ai r bor ne Sound Tr ansmi ssi on Loss of Bui l di ng Par t i t i ons and El ement s

NATI ONAL FI RE PROTECTI ON ASSOCI ATI ON ( NFPA)

NFPA 90A ( 2015) St andar d f or t he I nst al l at i on of Ai r Condi t i oni ng and Vent i l at i ng Syst ems

SHEET METAL AND AI R CONDI TI ONI NG CONTRACTORS' NATI ONAL ASSOCI ATI ON

(SMACNA)

SMACNA 1966 ( 2005) HVAC Duct Const r uct i on St andar ds Met al and Fl exi bl e, 3r d Edi t i on

SMACNA 1987 ( 2006) HVAC Duct Syst ems I nspect i on Gui de, 3r d Edi t i on

SOCI ETY FOR PROTECTI VE COATI NGS ( SSPC)

SSPC Pai nt i ng Manual ( 2002) Good Pai nt i ng Pr act i ce, St eel St r uct ur es Pai nt i ng Manual , Vol ume 1

SOCI ETY OF AUTOMOTI VE ENGI NEERS I NTERNATI ONAL ( SAE)

SAE AMS 2480 ( 2009; Rev H) Phosphat e Tr eat ment , Pai nt , Base

UNDERWRI TERS LABORATORI ES ( UL)

UL 181 ( 2013) Fact or y- Made Ai r Duct s and Ai r Connectors

UL 555 ( 2006; Repr i nt Aug 2016) UL St andar d f or Saf et y Fi r e Damper s

1. 2 SUBMITTALS

Gover nment appr oval i s r equi r ed f or submi t t al s wi t h a " G" desi gnat i on;

submi t t al s not havi ng a " G" desi gnat i on ar e For Cont r act or Qual i t y Cont r ol and f or i nf or mat i on onl y. When used, a desi gnat i on f ol l owi ng t he " G" desi gnat i on i dent i f i es t he of f i ce t hat wi l l r evi ew t he submi t t al f or t he

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Gover nment . Submi t t al s wi t h an " S" ar e f or i ncl usi on i n t he Sust ai nabi l i t y Not ebook, i n conf or mance t o Sect i on 01 33 29 SUSTAI NABI LI TY REPORTI NG. Submi t t he f ol l owi ng i n accor dance wi t h Sect i on 01 33 00

SUBMI TTAL PROCEDURES:

SD- 01 Pr econst r uct i on Submi t t al s

Mat er i al , Equi pment , and Fi xt ur e Li st s; G

Recor ds of Exi st i ng Condi t i ons; G

SD- 02 Shop Dr awi ngs

Connect i on Di agr ams; G

Of f set Fi t t i ng Conf i gur at i ons; G

SD- 03 Pr oduct Dat a

Equi pment and Per f or mance Dat a

Gal vani zed St eel Duct wor k Mat er i al s; G

Br azi ng Mat er i al s

Mi l l - Rol l ed Rei nf or ci ng and Suppor t i ng Mat er i al s

Round Sheet Met al Duct Fi t t i ngs; G

Round, Hi gh- Pr essur e, Doubl e- Wal l Sheet Met al Duct s; G

Tur ni ng Vanes; G

Sound Tr aps; G

Fl exi bl e Connect or s; G

Fl exi bl e Duct Mat er i al s

Power Oper at ed Damper s; G

Fi r e Damper s and Wal l Col l ar s; G

Gr avi t y Backdr af t and Rel i ef Damper s; G

Manual Vol ume Damper s; G

SD- 05 Desi gn Dat a

Desi gn Anal ysi s and Cal cul at i ons; G

SD- 06 Test Repor t s

Duct wor k Leakage Test s; G

Oper at i onal Test s; G

SD- 07 Cer t i f i cat es

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Li st i ng of Pr oduct I nst al l at i ons

Gal vani zed St eel Duct wor k Mat er i al s

Br azi ng Mat er i al s

Mi l l - Rol l ed Rei nf or ci ng and Suppor t i ng Mat er i al s

Round Sheet Met al Duct Fi t t i ngs

Round, Hi gh- Pr essur e, Doubl e- Wal l Sheet Met al Duct s

Tur ni ng Vanes

Dampers

Sound Tr aps

Fl exi bl e Connect or s

SD- 10 Oper at i on and Mai nt enance Dat a

Oper at i on and Mai nt enance Manual s; G

Power Oper at ed Damper s; G

Fi r e Damper s and Wal l Col l ar s; G

SD- 11 Cl oseout Submi t t al s

Recor d Dr awi ngs; G

1. 3 QUALI TY CONTROL

When f ur ni shi ng t he l i s t i ng of pr oduct i nst al l at i ons f or medi um and hi gh pr essur e duct wor k syst ems i ncl ude i dent i f i cat i on of at l east 5 uni t s, s i mi l ar t o t hose pr oposed f or use, t hat have been i n successf ul ser vi ce f or a mi ni mum per i od of 5 year s. I ncl ude pur chaser , addr ess of i nst al l at i on, ser vi ce or gani zat i on, and dat e of i nst al l at i on.

PART 2 PRODUCTS

I ncl ude t he manuf act ur er ' s st y l e or cat al og number s, speci f i cat i on and dr awi ng r ef er ence number s, war r ant y i nf or mat i on, and f abr i cat i on s i t e i nf or mat i on wi t hi n mat er i al , equi pment , and f i xt ur e l i s t s.

2. 1 SYSTEM DESCRI PTI ON

Pr ovi de l ow- pr essur e syst ems duct wor k and pl enums wher e maxi mum ai r vel oci t y i s 2, 000- f eet per mi nut e( f pm) and maxi mum st at i c pr essur e i s 2- i nches wat er gage ( wg) , posi t i ve or negat i ve.

Submi t connect i on di agr ams f or l ow pr essur e duct wor k syst ems i ndi cat i ng t he r el at i on and connect i on of devi ces and appar at us by showi ng t he gener al physi cal l ayout of al l cont r ol s, t he i nt er connect i on of one syst em ( or por t i on of syst em) wi t h anot her , and i nt er nal t ubi ng, wi r i ng, and ot her devi ces.

Hi gh vel oci t y syst ems duct wor k encompass syst ems wher e:

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a. Mi ni mum ai r vel oci t y exceeds 2, 000- f eet per mi nut e ( f pm) or st at i c pr essur e exceeds 2- i nches wat er gage ( wg) .

b. Medi um st at i c pr essur e r anges f r om over 2- i nches wg t hr ough 3- i nches wg, posi t i ve or negat i ve, or over 3- i nches wg t hr ough 6- i nches wg posi t i ve.

c. Hi gh st at i c pr essur e r anges f r om over 6- i nches wg t hr ough 10- i nches wg, positive.

d. Do not use r i gi d f i br ous- gl ass duct wor k.

2. 1. 1 Desi gn Requi r ement s

Submi t r ecor ds of exi st i ng condi t i ons i ncl udi ng t he r esul t s of a sur vey consi st i ng of wor k ar ea condi t i ons, and f eat ur es of exi st i ng st r uct ur es and f aci l i t i es wi t hi n and adj acent t o t he j obsi t e.

Submi t equi pment and per f or mance dat a f or medi um and hi gh pr essur e duct wor k syst ems consi st i ng of use l i f e, syst em f unct i onal f l ows, saf et y f eat ur es, and mechani cal aut omat ed det ai l s. Submi t t est r esponse and per f or mance char act er i st i cs cur ves f or cer t i f i ed equi pment .

Submi t desi gn anal ysi s and cal cul at i ons f or duct wor k syst ems i ndi cat i ng t he manuf act ur er ' s r ecommended ai r vel oci t i es, maxi mum st at i c pr essur e, and t emper at ur e cal cul at i ons.

2. 2 COMPONENTS

2. 2. 1 Round Sheet Met al Duct Fi t t i ngs

Submi t of f set f i t t i ng conf i gur at i ons f or appr oval . Shop f abr i cat e fittings.

2. 2. 1. 1 Fi t t i ngs Const r uct i on

Manuf act ur e as separ at e f i t t i ngs, not as t ap col l ar s wel ded or br azed i nt o duct sect i ons.

Pr ovi de t wo- pi ece t ype mi t er el bows f or angl es l ess t han 31 degr ees, t hr ee- pi ece t ype f or angl es 31 t hr ough 60 degr ees, and f i ve- pi ece t ype f or angl es 61 t hr ough 90 degr ees. Ensur e cent er l i ne r adi us of el bows i s 1- 1/ 2 t i mes f i t t i ng cr oss sect i on di amet er .

Pr ovi de coni cal t ype cr osses, i ncr easer s, r educer s, r educi ng t ees, and 90- degr ee t ees.

Ensur e cut out s i n f i t t i ng body ar e equal t o br anch t ap di mensi on or , wher e smal l er , excess mat er i al i s f l ar ed and r ol l ed i nt o smoot h r adi us nozzl e configuration.

2. 2. 2 Round, Hi gh- Pr essur e, Doubl e- Wal l Sheet Met al Duct s

Shop f abr i cat e duct s and f i t t i ngs.

Const r uct i on compr i ses of an ai r t i ght , vapor bar r i er , out er pr essur e shel l , a 1 i nch i nsul at i on l ayer , and a met al i nner l i ner t hat compl et el y cover s t he i nsul at i on t hr oughout t he syst em.

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Pr ovi de i nsul at i on conf or mi ng t o NFPA 90A and ASTM C1071 f or t her mal conduct i v i t y i n accor dance wi t h ASTM D257.

2. 2. 3 Reinforcement

Suppor t i nner l i ner s of bot h duct and f i t t i ngs by met al spacer s wel ded i n posi t i on t o mai nt ai n spaci ng and concent r i c i t y.

2. 2. 4 Fittings

Make di v i ded f l ow f i t t i ngs as separ at e f i t t i ngs, not t ap col l ar s i nt o duct sect i ons, wi t h t he f ol l owi ng const r uct i on r equi r ement s:

a. Sound, ai r t i ght , cont i nuous wel ds at i nt er sect i on of f i t t i ng body and tap

b. Tap l i ner secur el y wel ded t o i nner l i ner , wi t h wel d spaci ng not t o exceed 3- i nches.

c. Pack i nsul at i on ar ound t he br anch t ap ar ea f or compl et e cavi t y f i l l i ng.

d. Car ef ul l y f i t br anch connect i on t o cut out openi ngs i n i nner l i ner wi t hout spaces f or ai r er osi on of i nsul at i on and wi t hout shar p pr oj ect i ons t hat cause noi se and ai r f l ow di st ur bance.

Cont i nuousl y br aze seams i n t he pr essur e shel l of f i t t i ngs. Pr ot ect gal vani zed ar eas t hat have been damaged by wel di ng wi t h manuf act ur er ' s st andar d cor r osi on- r esi st ant coat i ng.

Const r uct t wo- pi ece t ype el bows f or angl es t hr ough 35 degr ees, t hr ee- pi ece t ype f or angl es 36 t hr ough 71 degr ees, and f i ve- pi ece t ype f or angl es 72 t hr ough 90 degr ees.

Pr ovi de coni cal t ype cr osses, i ncr easer s, r educer s, r educi ng t ees, and 90- degr ee t ees.

2. 2. 5 Tur ni ng Vanes

Pr ovi de doubl e- wal l t ype t ur ni ng vanes, commer ci al l y manuf act ur ed f or hi gh- vel oci t y syst em ser vi ce.

2. 2. 6 Dampers

Const r uct l ow pr essur e dr op, hi gh- vel oci t y manual vol ume damper s, and hi gh- vel oci t y f i r e damper s i n accor dance wi t h ASHRAE EQUI P I P HDBK, Chapt er 16, ASHRAE FUN I P, Chapt er 32 and SMACNA 1966.

2. 2. 7 Sound Tr aps

Pr ovi de sound t r aps.

Ensur e t he pr essur e dr op at t he r at ed f l ow does not exceed r at i ngs i n accor dance wi t h ASHRAE EQUI P I P HDBK, Chapt er 16, ASHRAE FUN I P, Chapt er 32 and SMACNA 1966 or desi gn cr i t er i a.

Ensur e t he sound t r ap i s ai r t i ght when oper at i ng under an i nt er nal pr essur e of 0. 37 pounds per squar e i nch. Pr ovi de an ai r - s i de sur f ace capabl e of wi t hst andi ng ai r vel oci t i es of 10, 000- f eet per mi nut e wi t hout any par t i cul at e mat t er l eavi ng t he t r ap and bei ng car r i ed downst r eam.

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2. 2. 7. 1 Attenuation

Fact or y f abr i cat e sound t r aps. Conf i r m cat al oged acoust i c at t enuat i on made by an i ndependent l abor at or y i n accor dance wi t h ASTM E90. Conf i r m pr essur e dr op measur ement s i n accor dance wi t h ASHRAE EQUI P I P HDBK, Chapt er 18. For noi se- r educt i on dat a, i ncl ude ef f ect s of f l anki ng pat hs and vi br at i on t r ansmi ssi on. Conduct t est s wi t h st andar d met al i nl et and out l et connect i ons under i ndi cat ed capaci t y f l ow.

Ensur e at t enuat i on i s i n accor dance wi t h ASHRAE FUN I P. I ncl ude a gr aphi c syst em noi se spect r um cer t i f i cat i on i ndi cat i ng pr oposed f an sound power l evel . At t enuat i on of duct i ng syst em pr oposed f or i nst al l at i on i s based on ASHRAE FUN I P f or bends, br anches, and ot her duct syst em const r uct i on noi se cr i t er i a cur ve.

Reduce f an- r at ed sound- power l evel t o not l ess t han 65 deci bel s i n t he 250- her t z t hi r d oct ave band when measur ed at t he sound t r ap di schar ge end.

2. 2. 7. 2 Const r uct i on of Sound Tr aps

Pr ovi de doubl e- met al wal l ed, sound t r aps. Pr ovi de mi l l - gal vani zed sheet met al st eel wi t h commer ci al wei ght of z i nc, conf or mi ng t o ASTM A653/ A653M.

Ext er i or met al act s as a vapor bar r i er . Met al t hi ckness i s not l ess t han t hat r equi r ed f or t he pr essur e ser vi ce, i n accor dance wi t h ASHRAE EQUI P I P HDBK, Chapt er 16, ASHRAE FUN I P, Chapt er 32 and SMACNA 1966, but not l ess t han 22- gage. Cover absor bi ng mat er i al , on t he sound- i mpi ngi ng si de, wi t h f or med per f or at ed mi l l - gal vani zed st eel of not l ess t han 24- gage. Ensur e al l ext er i or sheet j oi nt s ar e cont i nuousl y wel ded, or const r uct wi t h l ockset s f i l l ed wi t h chl or opr ene mast i c pr i or t o forming.

Spot wel d i nt er i or sur f aces not mor e t han 3- i nches on cent er . Ensur e al l connect i ons t o duct t r ansi t i ons ar e f l anged wi t h t hr ough- bol t ed 1/ 8- i nch by 1- i nch cont i nuous r ubber gasket i ng. Pr ovi de vi br at i on i sol at ed t r apeze t ype suppor t s.

Pr ovi de f i br ous gl ass absor pt i on mat er i al . Ensur e sur f aces exposed t o ai r st r eam ar e chl or opr ene coat ed or pr ot ect ed wi t h woven f i br ous- gl ass c l ot h conf or mi ng t o ASTM C1071. Ensur e t he t ot al compr essed t hi ckness gi ves t he r equi r ed at t enuat i on, and t her mal i nsul at i on t o pr ecl ude condensat i on on ext er i or sur f ace under nor mal oper at i ng condi t i ons.

Compr essed mat er i al densi t y i s appr oxi mat el y 4. 5 pounds per cubi c f oot .

Sel ect mat er i al s conf or mi ng t o f i r e hazar d r equi r ement s of NFPA 90A.

2. 2. 8 Fl exi bl e Connect or s f or Sheet Met al

Use UL l i s t ed connect or s, 30- ounce per squar e yar d, wat er pr oof , f i r e- r et ar dant , ai r t i ght , woven f i br ous- gl ass c l ot h, doubl e coat ed wi t h chl or opr ene. Cl ear wi dt h, not i ncl udi ng cl ampi ng sect i on, i s 6 t o 8- i nches.

2. 2. 9 Duct Hanger s

For duct hanger s i n cont act wi t h gal vani zed duct sur f aces, pr ovi de gal vani zed st eel pai nt ed wi t h i nor gani c z i nc.

2. 2. 10 Mi l l - Rol l ed Rei nf or ci ng and Suppor t i ng Mat er i al s

Pr ovi de mi l l - r ol l ed st r uct ur al st eel conf or mi ng t o ASTM A36/ A36M.

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Whenever i n cont act wi t h sheet met al duct i ng, pr ovi de gal vani zed st eel i n accor dance wi t h ASTM A123/ A123M.

I n l i eu of mi l l - r ol l ed st r uct ur al st eel , submi t equi val ent st r engt h, pr opr i et ar y- desi gn, r ol l ed- st eel st r uct ur al suppor t syst ems f or appr oval .

2. 2. 11 Fl exi bl e Duct Mat er i al s

Ensur e f l exi bl e duct connect or s compl y wi t h NFPA 90A, and conf or m wi t h UL 181, Cl ass 1 mat er i al .

2. 2. 12 Manual Vol ume Damper s

Conf or m t o SMACNA 1966 f or vol ume damper const r uct i on.

Equi p damper s wi t h an i ndi cat i ng quadr ant r egul at or wi t h a l ocki ng f eat ur e ext er nal l y l ocat ed and easi l y accessi bl e f or adj ust ment and st andof f br acket s t o al l ow mount i ng out si de ext er nal i nsul at i on. Wher e damper r od l engt hs exceed 30- i nches, pr ovi de a r egul at or at each end of damper shaf t .

2. 2. 12. 1 Damper Const r uct i on

Pr ovi de al l damper shaf t s wi t h t wo- end bear i ngs.

Ensur e spl i t t er damper i s 22 - gage sheet met al . Hi nges ar e 1/ 8- i nch t hi ck door t ype.

Pr ovi de a f ul l l engt h damper shaf t and ext end i t beyond t he damper bl ade.

use a 3/ 8 - i nch squar e shaf t f or damper l engt hs up t o 20 - i nches and a 1/ 2

- i nch squar e shaf t f or damper l engt hs 20 - i nches and l ar ger . Wher e necessar y t o pr event damper v i br at i on or s l i ppage, pr ovi de adj ust abl e suppor t r ods wi t h l ocki ng pr ovi s i ons ext er nal t o duct at damper bl ade end.

Pr ovi de damper s i n duct s havi ng a wi dt h per pendi cul ar t o t he axi s of t he damper t hat i s gr eat er t han 12 - i nches of mul t i bl ade t ype havi ng a subst ant i al f r ame wi t h bl ades f abr i cat ed of 16 - gage met al . Pr ovi de bl ades not exceedi ng 10 - i nches i n wi dt h and 48 - i nches i n l engt h, wel ded t o 1/ 2 - i nch di amet er shaf t s. Ensur e damper s gr eat er t han 48 - i nches i n wi dt h ar e made i n t wo or mor e sect i ons wi t h i nt er medi at e mul l i ons, each sect i on bei ng mechani cal l y i nt er l ocked wi t h t he adj oi ni ng sect i on or sect i ons. Pr ovi de bl ades wi t h gr aphi t e- i mpr egnat ed nyl on bear i ngs and connect so t hat adj oi ni ng bl ades r ot at e i n opposi t e di r ect i ons.

2. 2. 13 Gr avi t y Backdr af t and Rel i ef Damper s

Const r uct f r ames of not l ess t han 1- 1/ 2- by 4- i nch r ei nf or ced 16- gage gal vani zed car bon st eel . Sol i dl y secur e f r ames and mul l i ons i n pl ace and seal wi t h el ast omer caul k i ng agai nst ai r bypass.

Pr ovi de shaf t bear i ngs wi t h gr aphi t e- i mpr egnat ed nyl on .

Equi p count er bal anced damper s wi t h f i xed or adj ust abl e count er bal anci ng weights.

Gr avi t y backdr af t damper s may be equi pment manuf act ur er ' s st andar d const r uct i on i n s i zes 18 by 18 - i nch or smal l er , when f ur ni shed i nt egr al wi t h ai r movi ng equi pment .

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2. 2. 13. 1 Bl ade Const r uct i on

Maxi mum bl ade wi dt h i s 9 i nches, and maxi mum bl ade l engt h i s 36 - i nches.

Bl ade mat er i al i s 16- gage gal vani zed st eel . Pr ovi de bl ades wi t h mechani cal l y r et ai ned seal s and 90- degr ee l i mi t st ops.

Bl ades l i nked t oget her f or r el i ef ser vi ce damper s ar e t o open not l ess t han 30 degr ees on 0. 05- i nch wg di f f er ent i al pr essur e.

2. 2. 14 Power - Oper at ed Damper s

Ensur e damper s conf or m t o appl i cabl e r equi r ement s speci f i ed under Sect i on

23 09 33. 00 40 ELECTRI C AND ELECTRONI C CONTROL SYSTEM FOR HVAC.

2. 2. 15 Fi r e Damper s and Wal l Col l ar s

Ensur e f i r e damper l ocat i ons ar e i n accor dance wi t h NFPA 90A.

Pr ovi de f i r e damper s i n duct wor k at f i r ewal l bar r i er s.

Const r uct and l abel f i r e damper s i n accor dance wi t h UL 555 t o pr ovi de damper and mount i ng f i r e- r esi st ance t hat equal s or exceeds f i r e- r esi st ance of t he const r uct i on i n whi ch i nst al l ed. For l i nk l oads i n excess of 20 pounds , pr ovi de UL- appr oved quar t zoi d l i nks.

Const r uct wal l col l ar s i n accor dance wi t h UL 555.

2. 3 MATERIALS

2. 3. 1 Gal vani zed St eel Duct wor k Mat er i al s

Pr ovi de hot - di p gal vani zed car bon st eel duct wor k sheet met al of l ock- f or mi ng qual i t y, wi t h r egul ar spangl e- t ype zi nc coat i ng, conf or mi ng to ASTM A924/ A924M and ASTM A653/ A653M, Desi gnat i on G90. Tr eat duct sur f aces t o be pai nt ed by anneal i ng.

Conf or m t o ASHRAE EQUI P I P HDBK, Chapt er 16, ASHRAE FUN I P, Chapt er 32 and SMACNA 1966 f or sheet met al gages and r ei nf or cement t hi ckness.

Low pr essur e duct wor k mi ni mum t hi cknesses ar e:

MI NI MUM SHEET METAL THI CKNESS

DUCT WI DTH

INCHES

GAGE

0-12 26

13-30 24

31-60 22

2. 3. 2 Br azi ng Mat er i al s

Pr ovi de si l i con br onze br azi ng mat er i al s conf or mi ng t o AWS A5. 8/ A5. 8M.

2. 3. 3 Mi l l - Rol l ed Rei nf or ci ng and Suppor t i ng Mat er i al s

Conf or m t o ASTM A36/ A36M f or mi l l - r ol l ed st r uct ur al st eel . Wher ever i n cont act wi t h sheet met al duct i ng, gal vani ze t o conf or mi ng wi t h

ASTM A123/ A123M .

Apr i l 2019 Page 9 SECTI ON 23 31 13. 00 40

I n l i eu of mi l l - r ol l ed st r uct ur al st eel , submi t f or appr oval , equi val ent st r engt h, pr opr i et ar y desi gn, r ol l ed- st eel st r uct ur al suppor t syst ems.

PART 3 EXECUTI ON

3. 1 PREPARATION

For sheet met al sur f aces t o be pai nt ed, and sur f aces t o whi ch adhesi ves ar e t o be appl i ed, c l ean sur f ace of oi l , gr ease, and del et er i ous substances.

Ensur e st r engt h i s adequat e t o pr event f ai l ur e under ser vi ce pr essur e or vacuum cr eat ed by f ast c l osur e of duct devi ces. Pr ovi de l eakt i ght , aut omat i c r el i ef devi ces.

3. 1. 1 Const r uct i on St andar ds

Pr ovi de sheet met al const r uct i on i n accor dance wi t h t he r ecommendat i ons f or best pr act i ces i n ASHRAE EQUI P I P HDBK, Chapt er 16, ASHRAE FUN I P, Chapt er 32, SMACNA 1966, and NFPA 90A.

Desi gn and f abr i cat e suppl ement ar y st eel i n accor dance wi t h AI SC 360 and

AI SC 325.

Wher e const r uct i on met hods f or cer t ai n i t ems ar e not descr i bed i n t he r ef er enced st andar ds or her ei n, per f or m t he wor k i n accor dance wi t h r ecommendat i ons f or best pr act i ce def i ned i n ASHRAE EQUI P I P HDBK.

3. 2 INSTALLATION

Fabr i cat e an ai r t i ght syst em. I ncl ude r ei nf or cement s, br aci ng, suppor t s, f r ami ng, gasket i ng, seal i ng, and f ast eni ng t o pr ovi de r i gi d const r uct i on and f r eedom f r om vi br at i on, ai r f l ow- i nduced mot i on and noi se, and excessi ve def l ect i on at speci f i ed maxi mum syst em ai r pr essur e and vel oci t y.

Pr ovi de of f set s and t r ansf or mat i ons as r equi r ed t o avoi d i nt er f er ence wi t h t he bui l di ng const r uct i on, pi pi ng, or equi pment .

Make pl enum anchor age pr ovi s i ons, sheet met al j oi nt s, and ot her ar eas ai r t i ght and wat er t i ght by caul k i ng, mat i ng gal vani zed st eel and concr et e sur f aces wi t h a t wo- component el ast omer .

3. 2. 1 Jointing

Encl ose damper s l ocat ed behi nd ar chi t ect ur al i nt ake or exhaust l ouver s by a r i gi d sheet met al col l ar and seal ed t o bui l di ng const r uct i on wi t h el ast omer s f or compl et e ai r t i ght ness.

Pr ovi de out si de ai r - i nt ake duct s and pl enums made f r om sheet met al wi t h sol der ed wat er t i ght j oi nt s.

3. 2. 2 Ducts

Wher ever duct s pass t hr ough f i r ewal l s or t hr ough wal l s or f l oor s di v i di ng condi t i oned spaces f r om uncondi t i oned spaces, pr ovi de a f l anged segment i n t hat sur f ace dur i ng sur f ace const r uct i on.

Wher e i nt er i or s of duct i ng may be vi ewed t hr ough ai r di f f usi on devi ces, Apr i l 2019 Page 10 SECTI ON 23 31 13. 00 40 const r uct t he v i ewed i nt er i or wi t h sheet met al and pai nt f l at bl ack.

3. 2. 2. 1 Duct wor k Cl eani ng Pr ovi s i ons

Pr ot ect open duct i ng f r om const r uct i on dust and debr i s i n a manner appr oved by t he Cont r act i ng Of f i cer . Cl ean di r t y assembl ed duct i ng by subj ect i ng al l mai n and br anch i nt er i or sur f aces t o ai r st r eams movi ng at vel oci t i es t wo t i mes speci f i ed wor ki ng vel oci t i es, at st at i c pr essur es wi t hi n maxi mum r at i ngs. Thi s may be accompl i shed by: f i l t er - equi pped por t abl e bl ower s whi ch r emai n t he Cont r act or ' s pr oper t y; wheel - mount ed, compr essed- ai r oper at ed per i met er l ances whi ch di r ect t he compr essed ai r and whi ch ar e pul l ed i n t he di r ect i on of nor mal ai r f l ow; or ot her means appr oved by t he Cont r act i ng Of f i cer . Use wat er - and oi l - f r ee compr essed ai r f or c l eani ng duct i ng. Af t er const r uct i on i s compl et e, and pr i or t o accept ance of t he wor k, r emove const r uct i on dust and debr i s f r om ext er i or sur f aces. Cl ean i n conf or mance wi t h SMACNA 1987.

3. 3 APPLICATION

3. 3. 1 Low Pr essur e Sheet Met al Duct s

Wel d angl e i r on f r ames at cor ner s and ends, whenever possi bl e. Ri vet or wel d angl e i r on r ei nf or cement s t o duct s not mor e t han 6- i nches on cent er , wi t h not l ess t han t wo poi nt s of at t achment . Spot wel di ng, wher e used, i s 3- i nches on cent er .

Seal st andar d seam j oi nt s wi t h an el ast omer compound t o compl y wi t h SMACNA 1966 Seal Cl ass A, B or C as appl i cabl e.

Li mi t cr ossbr eaki ng t o 4- f eet and pr ovi de on al l duct s 8- i nches wi de and wi der . Pr ovi de bead r ei nf or cement i n l i eu of cr ossbr eaki ng wher e panel poppi ng may occur . Wher e r i gi d i nsul at i on i s appl i ed, cr ossbr eaki ng i s not r equi r ed.

3. 3. 1. 1 Longi t udi nal Duct Seams

Pr ovi de Pi t t sbur gh l ock cor ner seams.

3. 3. 1. 2 Joi nt s and Gasket s

Bol t compani on angl e f l anges t oget her wi t h 1/ 4 - i nch di amet er bol t s and nut s spaced 6 - i nches on cent er . Gasket f l anged j oi nt s wi t h chl or opr ene f ul l - f ace gasket s 1/ 8 - i nch t hi ck, wi t h Shor e A 40 dur omet er har dness.

Use one pi ece gasket s, vul cani zed at j oi nt s.

3. 3. 1. 3 Fl exi bl e Duct Joi nt s

Bet ween f l exi bl e duct wi t hout sheet met al col l ar s and r ound met al duct wor k connect i ons make j oi nt s by t r i mmi ng t he ends, coat i ng t he i nsi de of t he f l exi bl e duct f or a di st ance equal t o dept h of i nser t i on wi t h el ast omer caul k, and by secur i ng wi t h sheet met al scr ews or bi ndi ng wi t h a st r ap clamp.

3. 3. 1. 4 Squar e El bows

Pr ovi de si ngl e- vane duct t ur ns i n accor dance wi t h SMACNA 1966, use on duct s 12 i nches i n wi dt h and nar r ower .

Apr i l 2019 Page 11 SECTI ON 23 31 13. 00 40

3. 3. 1. 5 Radi us El bows

Conf or m t o SMACNA 1966 f or r adi us el bows. Pr ovi de an i nsi de r adi us equal t o t he wi dt h of t he duct . Wher e i nst al l at i on condi t i ons pr ecl ude use of st andar d el bows, t he i nsi de r adi us may be r educed t o a mi ni mum of 0. 25 t i mes duct wi dt h. I nst al l t ur ni ng vanes i n accor dance wi t h t he f ol l owi ng schedule.

RADI US OF TURNI NG VANES I N PERCENT OF DUCT WI DTH

WI DTH OF ELBOWS

INCHES

VANE NO. 1 VANE NO. 2 VANE NO. 3

Up t o 16 56 -- --

17 t o 48 43 73 --

49 and over 37 55 83

Wher e t wo el bows ar e pl aced t oget her i n t he same pl ane f or duct s 30- i nches wi de and l ar ger , cont i nue t he gui de vanes t hr ough bot h el bows r at her t han spaced i n accor dance wi t h above schedul e.

3. 3. 1. 6 Out l et s, I nl et s, and Duct Br anches

I nst al l br anches, i nl et s, and out l et s so t hat ai r t ur bul ence i s r educed t o a mi ni mum and ai r vol ume pr oper l y appor t i oned. I nst al l adj ust abl e spl i t t er damper s at al l suppl y j unct i ons t o per mi t adj ust ment of t he amount of ai r ent er i ng t he br anch. Wher ever an ai r - di f f usi on devi ce i s shown as bei ng i nst al l ed on t he si de, t op, or bot t om of a duct , and whenever a br anch t ake- of f i s not of t he spl i t t er t ype; pr ovi de a commer ci al l y manuf act ur ed 45 degr ee si de- t ake- of f ( STO) f i t t i ng wi t h manual vol ume damper t o al l ow adj ust ment of t he ai r quant i t y and t o pr ovi de an even f l ow of ai r acr oss t he devi ce or duct i t ser vi ces.

Wher e a duct br anch i s t o handl e mor e t han 25 per cent of t he ai r handl ed by t he duct mai n, use a compl et e 90- degr ee i ncr easi ng el bow wi t h an i nsi de r adi us of 0. 75 t i mes br anch duct wi dt h. Si ze of t he l eadi ng end of t he i ncr easi ng el bow wi t hi n t he mai n duct wi t h t he same r at i o t o t he mai n duct s i ze as t he r at i o of t he r el at ed ai r quant i t i es handl ed.

Wher e a duct br anch i s t o handl e 25 per cent or l ess of t he ai r handl ed by t he duct mai n, const r uct t he br anch connect i on wi t h a 45 degr ee si de t ake- of f ent r y i n accor dance wi t h SMACNA 1966.

3. 3. 1. 7 Duct Tr ansi t i ons

Wher e t he shape of a duct changes, ensur e t he angl e of t he s i de of t he t r ansi t i on pi ece does not exceed 15 degr ees f r om t he st r ai ght r un of duct connect ed t her et o.

Wher e equi pment i s i nst al l ed i n duct wor k, ensur e t he angl e of t he s i de of t he t r ansi t i on pi ece f r om t he st r ai ght r un of duct connect ed t her et o does not exceed 15 degr ees on t he upst r eam si de of t he equi pment and 22- 1/ 2 degr ees on t he downst r eam si de of t he equi pment .

3. 3. 1. 8 Br anch Connect i ons

Const r uct r adi us t ap- i ns i n accor dance wi t h SMACNA 1966.

Apr i l 2019 Page 12 SECTI ON 23 31 13. 00 40

3. 3. 1. 9 Access Openi ngs

Const r uct access door i n accor dance wi t h SMACNA 1966, except t hat s l i di ng door s may be used onl y f or speci al condi t i ons upon pr i or appr oval .

Pr ovi de doubl e- panel t ype door s.

I nst al l access door s and panel s i n duct wor k upst r eam and downst r eam f r om coi l s adj acent t o f i r e damper s at cont r ol s or at any i t em r equi r i ng per i odi c i nspect i on, adj ust ment , mai nt enance, or c l eani ng , and ever y 20- f eet f or i ndoor ai r qual i t y housekeepi ng pur poses.

Mi ni mum access openi ng si ze i s 12 by 18 - i nches, unl ess pr ecl uded by duct di mensi ons or ot her wi se i ndi cat ed.

Make ai r t i ght access door s t hat l eak by addi ng or r epl aci ng hi nges and l at ches or by const r uct i on of new door s adequat el y r ei nf or ced, hi nged, and latched.

3. 3. 1. 10 Duct Access f or Cl eani ng

Make duct access par t i cul ar l y sui t abl e f or commer ci al duct c l eani ng met hods ut i l i z i ng vacuum devi ces. Space access openi ngs wi t h a f r equency and at poi nt s t hat per mi t s r eady access t o duct i nt er nal s wi t h essent i al l y no duct or i nsul at i on cut t i ng. Wher e access t hr ough an ai r - di f f usi on devi ce or t hr ough access door s speci f i ed her ei n i s not avai l abl e at a speci f i c poi nt , pr ovi de 8 - i nch di amet er , 16 - gage access pl at es not mor e t han 10 - f eet on cent er . Wher e duct i s i nsul at ed and vapor - seal ed, pr ovi de mast i c seal s ar ound ci r cumf er ence of access. When access pl at e i s i n pl ace and i nsul at ed, ext er nal l y i dent i f y t he l ocat i on.

3. 3. 1. 11 Pl enum Const r uct i on

Pr ovi de i nt ake and di schar ge pl enum compani on angl e j oi nt s wi t h t he f ol l owi ng mi ni mum t hi ckness of mat er i al s:

LONGEST ANGLES

SI DE

INCHES

SHEET METAL

USS GAGE

ALL SI DES

COMPANI ON ANGLES

INCHES

REINFORCEMENT

24 I NCHES ON

CENTER MAXI MUM

To 48 20 1- 1/ 2 by 1- 1/ 2 by 1/8

1- 1/ 2 by 1- 1/ 2 by 1/ 8

49 t o 84 18 2 by 2 by 1/ 8 2 by 2 by 3/ 16

85 t o 120 16 2 by 2 by 1/ 8 2 by 2 by 1/ 8

121 and l ar ger 14 2 by 2 by 3/ 16 2 by 2 by 3/ 16

At t he f l oor l i ne and ot her poi nt s wher e pl enums j oi n masonr y const r uct i on, bol t panel s 12 - i nches on cent er t o 2- by 2- by 3/ 16 - i nch t hi ck hot - di p gal vani zed st eel angl e t hat has been secur ed t o t he masonr y wi t h masonr y anchor s and bol t s 24- i nches on cent er and caul ked t i ght t o t he masonr y.

Anchor panel s t o cur bi ng wi t h hot - di p gal vani zed st eel angl e i r on of a s i ze not l ess t han 2- by 2- by 3/ 16 - i nch t hi ck. Concr et e cur bi ng i ncl udes angl e i r on nosi ng wi t h wel ded st uds f or t he anchor i ng of panel s.

Level nosi ng at cur b hei ght wi t hi n pl us or mi nus 1/ 16 - i nch.

Apr i l 2019 Page 13 SECTI ON 23 31 13. 00 40

Wel d and gr i nd mi t er cor ner s f or angl e i r on and channel i r on.

3. 3. 1. 12 Pl enum Door Const r uct i on

Const r uct pl enum access door s i n accor dance wi t h SMACNA 1966 except t hat access door s smal l er t han man- access door s have door openi ngs f r amed wi t h angl e i r on t hat i s one commer ci al s i ze smal l er t han t he speci f i ed panel reinforcement.

Ensur e man- access door s i ze conf or ms t o SMACNA 1966 and par agr aph ACCESS OPENI NGS. I nsul at ed and uni nsul at ed const r uct i on i s per SMACNA 1966.

Fr ame door openi ngs wi t h channel i r on. Fr ame door s wi t h angl e i r on.

Si ze channel i r on and angl e i r on appr oxi mat el y t he same si ze as speci f i ed panel r ei nf or cement . Pr ovi de ext er i or door ski n 16 gage. Fabr i cat e l at ches f r om st eel wi t h hi nges at l east 4 - i nches l ong, and bol t s at l east 3/ 8 - i nch di amet er .

3. 3. 1. 13 Manual Vol ume Damper s

Pr ovi de bal anci ng damper s of t he spl i t t er , but t er f l y, or mul t i l ouver t ype, t o bal ance each r espect i ve mai n and br anch duct .

For damper s r egul at ed t hr ough cei l i ngs pr ovi de a r egul at or conceal ed i n a box mount ed i n t he cei l i ng, wi t h a cover f i ni sh aest het i cal l y compat i bl e wi t h cei l i ng sur f ace. Wher e cei l i ng i s of r emovabl e const r uct i on, set r egul at or s above t he cei l i ng, and mar k t he l ocat i on on cei l i ng i n a manner accept abl e t o t he Cont r act i ng Of f i cer .

3. 3. 1. 14 Fl exi bl e Connect or s f or Sheet Met al

Connect ai r handl i ng equi pment , duct s cr ossi ng bui l di ng expansi on j oi nt s, and f an i nl et s and out l et s t o upst r eam and downst r eam component s by t r eat ed woven- cl ot h connect or s.

I nst al l connect or s onl y af t er syst em f ans ar e oper at i ve, and vi br at i on i sol at i on mount i ngs have been adj ust ed. When syst em f ans ar e oper at i ng, ensur e connect or s ar e f r ee of wr i nkl es caused by mi sal i gnment or f an r eact i on. Wi dt h of sur f ace i s cur vi l i near .

3. 3. 2 Rect angul ar Sheet Met al Duct s

3. 3. 2. 1 Medi um- Pr essur e Gages, Joi nt s, and Rei nf or cement

Ensur e mi ni mum sheet met al gages, j oi nt s, and r ei nf or cement s bet ween j oi nt s ar e i n accor dance wi t h ASHRAE EQUI P I P HDBK, Chapt er 16, ASHRAE FUN I P, Chapt er 32 and SMACNA 1966.

Ensur e sheet met al mi ni mum t hi ckness, t r ansver se r ei nf or cement bet ween j oi nt s, and j oi nt s of duct s ar e i n accor dance wi t h t he f ol l owi ng:

Apr i l 2019 Page 14 SECTI ON 23 31 13. 00 40

LONGEST

SIDE

(INCHES)

SHEET

METAL

GAGE

ALL SI DES

COMPANI ON ANGLE

(INCHES)

REI NFORCEMENT ANGLES

24 I NCHES ON

CENTER MAXI MUM

( BACK TO BACK)

97 t o 108 16 2 by 2 by 1/ 8, t wo t i e r ods al ong angl e

Two 2 by 2 by 1/ 8, t wo t i e r ods al ong angle

109 t o 132 16 2 by 2 by 3/ 16, t wo t i e r ods al ong angl e

Two 2 by 2 by 3/ 16, t wo t i e r ods al ong angle

133 and l onger 14 2 by 2 by 3/ 16, wi t h t i e r ods ever y 48 i nches

Two 2 by 2 by 3/ 16, wi t h t i e r ods ever y 48 inches

3. 3. 2. 2 Medi um- And Hi gh- Pr essur e Br anches, I nl et s, Out l et s

I nst al l br anches, i nl et s, and out l et s t o mi ni mi ze ai r t ur bul ence and t o ensur e pr oper ai r f l ow.

I nst al l damper s so t hat t he amount of ai r ent er i ng duct mai ns i s adjustable.

Pr ovi de commer ci al l y manuf act ur ed ai r ext r act or s t o al l ow adj ust ment of t he ai r quant i t y and t o pr ovi de an even f l ow of ai r acr oss t he devi ce or duct ser ved.

3. 3. 2. 3 Duct Br anch Tr ansi t i on

Wher e a duct br anch handl es over 25 per cent of t he ai r t r anspor t ed by t he duct mai n, use a compl et e 90- degr ee i ncr easi ng el bow, wi t h an i nsi de r adi us of 0. 75 t i mes duct br anch wi dt h. Ensur e t he s i ze of t he t r ai l i ng end of t he i ncr easi ng el bow wi t hi n t he mai n duct has t he same r at i o t o t he mai n duct s i ze as t he r at i o of t he r el at i ve ai r quant i t i es handl ed.

Wher e a duct br anch i s t o handl e 25 per cent or l ess of t he ai r handl ed by t he duct mai n, pr ovi de a br anch connect i on wi t h an i nsi de r adi us of 0. 75 t i mes br anch duct wi dt h, a mi ni mum ar c l engt h of 45 degr ees, and an out si de r adi us of 1. 75 t i mes duct br anch wi dt h. Pl ace ar c t angent t o duct main.

3. 3. 2. 4 Hi gh- Pr essur e Gages, Joi nt s, and Rei nf or cement

Ensur e sheet met al mi ni mum t hi ckness, j oi nt s, and r ei nf or cement bet ween j oi nt s ar e i n accor dance wi t h ASHRAE EQUI P I P HDBK, Chapt er 16, ASHRAE FUN I P, Chapt er 32 and SMACNA 1966.

Use t he f ol l owi ng t ypes of ASHRAE EQUI P I P HDBK, Chapt er 16, ASHRAE FUN I P, Chapt er 32 and SMACNA 1966 j oi nt s and seams:

Tr ansver se Joi nt s:

a. Wel ded f l ange j oi nt wi t h angl e

b. Compani on angl e f l anged j oi nt

Longi t udi nal Seams:

Apr i l 2019 Page 15 SECTI ON 23 31 13. 00 40

a. Appr oved l ock seams, back br azed, or cont i nuousl y br azed seams f or duct s wi t h l ar gest di mensi on up t o 72- i nches

b. Cont i nuousl y wel ded or br azed seams f or duct s wi t h l ar gest di mensi on gr eat er t han 72- i nches

Sheet met al mi ni mum t hi ckness, t r ansver se r ei nf or cement bet ween j oi nt s, and compani on angl e j oi nt s of duct s wi t h l ongest s i de gr eat er t han 96 i nches ar e i n accor dance wi t h t he f ol l owi ng:

LONGEST

SIDE

(inches)

SHEET METAL

GAGE

ALL SI DES

COMPANI ON ANGLE

(inches)

REI NFORCEMENT ANGLES

24 I NCHES ON

CENTER MAXI MUM

( BACK TO BACK)

97 t o 108 16 2 by 2 by 1/ 8, t wo t i e r ods al ong angl e

* Two 2 by 2 by 1/ 8, t wo t i e r ods al ong angl e

109 t o 132 16 2 by 2 by 3/ 16, t wo t i e r ods al ong angl e

* Two 2 by 2 by 3/ 16, t wo t i e r ods al ong angl e

133 and l onger 14 2- 1/ 2 by 2- 1/ 2 by 3/ 16, wi t h t i e r ods ever y 24 i nches

* Two 2- 1/ 2 by 2- 1/ 2 by 3/16, wi t h t i e r ods ever y 24 i nches

3. 3. 3 Round Sheet Met al Duct s

3. 3. 3. 1 Duct Gages and Rei nf or cement

Sheet met al mi ni mum t hi ckness, j oi nt s, and r ei nf or cement bet ween j oi nt s shal l be i n accor dance wi t h ASHRAE EQUI P I P HDBK, Chapt er 16, ASHRAE FUN I P, Chapt er 32 and SMACNA 1966.

Pr ovi de duct s wi t h suppl ement al gi r t h angl e suppor t s, r i vet ed wi t h sol i d r i vet s 6 i nches on cent er t o duct . Locat e gi r t h angl es as f ol l ows:

DI AMETER, I NCHES REI NFORCEMENT- MAXI MUM SPACI NG

INCHES

25 t o 36 1- 1/ 4 by 1- 1/ 4, 1/ 8 t hi ck, 72 i nches on center

37 t o 50 1- 1/ 4 by 1- 1/ 4, 1/ 8 t hi ck, 60 i nches on center

51 t o 60 1- 1/ 2 by 1- 1/ 2, 1/ 8 t hi ck, 48 i nches on center

Use hex- shaped bol t heads and nut s, 5/ 16- i nch di amet er f or duct s up t o 50- i nch di amet er , and 3/ 8- i nch di amet er f or 51- i nch di amet er duct s and larger.

Cont i nuousl y wel d f l anges t o duct on out si de of duct and i nt er mi t t ent l y wel ded wi t h 1- i nch wel ds ever y 4- i nches on i nsi de j oi nt f ace. Remove

Apr i l 2019 Page 16 SECTI ON 23 31 13. 00 40 excess f i l l er met al f r om i nsi de f ace. Pr ot ect gal vani zed ar eas t hat have been damaged by wel di ng wi t h manuf act ur er ' s st andar d cor r osi on- r esi st ant coating.

3. 3. 3. 2 Duct Joi nt s

Pr ovi de duct j oi nt s manuf act ur ed by machi ne, wi t h spi r al l ockset s up t o and i ncl udi ng 60- i nch di amet er s, and t o di mensi onal t ol er ances compat i bl e wi t h f i t t i ngs pr ovi ded. Dr aw- band gi r t h j oi nt s ar e not accept abl e.

Pr epar e s l i p j oi nt s by coat i ng t he mal e f i t t i ng wi t h el ast omer seal i ng mat er i al s, exer ci s i ng car e t o pr event mast i c f r om ent er i ng f i t t i ng bor e.

Leave onl y a t hi n annul ar mast i c l i ne exposed i nt er nal l y. Use sheet met al scr ews t o make assembl y r i gi d, not l ess t han f our scr ews per j oi nt , maxi mum spaci ng 6- i nches. Do not use pop r i vet s. Tape and heat seal al l joints.

3. 3. 3. 3 Duct Tr ansi t i ons

Wher e t he shape of a duct changes, ensur e t he angl e of t he s i de of t he t r ansi t i on pi ece does not exceed 15 degr ees f r om t he st r ai ght r un of duct connect ed t her et o.

Wher e equi pment i s i nst al l ed i n duct wor k, ensur e t he angl e of t he s i de of t he t r ansi t i on pi ece f r om t he st r ai ght r un of duct connect ed t her et o does not exceed 15 degr ees on t he upst r eam si de of t he equi pment and 22- 1/ 2 degr ees on t he downst r eam si de of t he equi pment .

3. 3. 4 Round, Hi gh Pr essur e, Sheet Met al Duct I nst al l at i on

3. 3. 4. 1 Joints

Pr ovi de an i nner coupl i ng t o al i gn t he i nner l i ni ng t o mai nt ai n good ai r f l ow condi t i ons equi val ent t o st andar d r ound hi gh- pr essur e duct j oi nt s. But t j oi nt s ar e not sui t abl e f or t he i nner l i ner . Accompl i sh t hi s al i gnment by . For duct s over 34- i nches i nsi de di amet er , pr ovi de a separ at e coupl i ng f or i nner al i gnment , wi t h t he pr essur e shel l s j oi ned by angl e- r i ng f l anged connect i ons.

3. 3. 4. 2 I nsul at i on Ends

At t he end of an uni nsul at ed sect i on or r un wher e i nt er nal l y i nsul at ed duct connect s t o uni nsul at ed spi r al duct , f i t t i ng, f i r e damper or f l exi bl e duct , i nst al l an i nsul at ed end- f i t t i ng t o br i ng t he out er pr essur e shel l down t o nomi nal s i ze.

3. 3. 5 Tr ansver se Rei nf or cement Joi nt s

Pr ovi de t r ansver se r ei nf or cement s t hat ar e . Wel d t r ansver se r ei nf or cement at al l cor ner s t o f or m cont i nuous f r ames.

3. 3. 6 Joi nt Gasket s

For f l anged j oi nt s, use chl or opr ene f ul l - f ace gasket s 1/ 8- i nch t hi ck, wi t h Shor e A 40 dur omet er har dness. Use one- pi ece gasket s, vul cani zed at joints.

Apr i l 2019 Page 17 SECTI ON 23 31 13. 00 40

3. 3. 7 Radi us El bows

Fabr i cat e el bow pr opor t i ons and r adi us el bows i n accor dance wi t h ASHRAE EQUI P I P HDBK, Chapt er 16, ASHRAE FUN I P, Chapt er 32 and SMACNA 1966.

3. 3. 8 Pl enum Connect i ons

Ensur e r ound duct connect i ons ar e wel ded j oi nt bel l mout h t ype.

Ensur e r ect angul ar duct connect i ons ar e bel l mout h t ype, const r uct ed i n accor dance wi t h ASHRAE EQUI P I P HDBK, Chapt er 16, ASHRAE FUN I P, Chapt er 32 and SMACNA 1966.

3. 3. 9 Access Openi ngs

I nst al l access panel s i n duct wor k adj acent t o f i r e damper s.

Mi ni mum si ze of access openi ng i s 12 by 18 i nches, unl ess pr ecl uded by duct di mensi on.

Fr ame access openi ngs wi t h wel ded and gr ound mi t er j oi nt s, 1/ 8- i nch t hi ck angl e i r on, wi t h 1/ 4 - i nch st uds wel ded t o f r ame. Ensur e cover pl at es ar e not l ess t han 16- gage, r ei nf or ced as necessar y f or l ar ger s i zes const r uct ed of 12- gage met al .

I n l i eu of access door s, use r eadi l y accessi bl e f l anged duct sect i ons upon appr oval . Pr ovi de st abl e hanger suppor t s f or di sconnect ed duct t er mi nal .

3. 3. 10 Duct Suppor t s

I nst al l duct suppor t i n accor dance wi t h ASHRAE EQUI P I P HDBK, Chapt er 16, ASHRAE FUN I P, Chapt er 32 and SMACNA 1966. Meet t he mi ni mum si ze f or duct hanger s as speci f i ed i n ASHRAE EQUI P I P HDBK, Chapt er 16, ASHRAE FUN I P, Chapt er 32 and SMACNA 1966. Pr ovi de t wo hanger s wher e necessar y t o el i mi nat e sway. Suppor t at t achment t o duct sur f aces by wel di ng 4- i nches on cent er .

Take t he f ol l owi ng i nt o account i n sel ect i on of a hangi ng syst em:

a. Locat i on and pr ecedence of wor k under ot her sect i ons

b. I nt er f er ences of var i ous pi pi ng and el ect r i cal condui t

c. Equi pment , and bui l di ng conf i gur at i on

d. St r uct ur al and saf et y f act or r equi r ement s

e. Vi br at i on, and i mposed l oads under nor mal and abnor mal ser vi ce conditions

Suppor t s i zes, conf i gur at i ons, and spaci ng ar e gi ven t o show t he mi ni mal t ype of suppor t i ng component s r equi r ed. I f i nst al l ed l oads ar e excessi ve f or t he speci f i ed hanger spaci ng, hanger s, and accessor i es pr ovi de heavi er - dut y component s . Af t er syst em st ar t up, r epl ace any duct suppor t devi ce whi ch due t o l engt h, conf i gur at i on, or s i ze, v i br at es or causes possi bl e f ai l ur e of a member . Do not use a duct wor k suppor t syst em t hat al l ows a cascade- t ype f ai l ur e t o occur .

Do not hang duct wor k and equi pment f r om r oof deck, pi pi ng, or ot her duct s

Apr i l 2019 Page 18 SECTI ON 23 31 13. 00 40 or equi pment . Maxi mum span bet ween any t wo poi nt s i s 10- f eet , wi t h l esser spans as r equi r ed by duct assembl i es, i nt er f er ences, and per mi t t ed l oads imposed.

Wher e suppor t f r om met al deck syst ems i s i nvol ved, coor di nat e suppor t r equi r ement s wi t h i nst al l at i on of met al deck.

3. 3. 10. 1 Hangars

At t ach hanger r ods, angl es, and st r aps t o beam cl amps. Recei ve appr oval f r om t he Cont r act i ng Of f i cer f or concr et e i nser t s, masonr y anchor s, and f ast ener s f or t he appl i cat i on.

Har dened hi gh- car bon spr i ng- st eel f ast ener s f i t t ed ont o beams and mi scel l aneous st r uct ur al st eel ar e accept abl e upon pr i or appr oval of each pr oposed appl i cat i on and upon f i el d demonst r at i on of conf or mance t o speci f i cat i on r equi r ement s. Make f ast ener s f r om st eel conf or mi ng t o AI SI Type 1055 1070, t r eat ed and f i ni shed i n conf or mance wi t h SAE AMS 2480, Type Z ( z i nc phosphat e base) , Cl ass 2 ( suppl ement ar y t r eat ment ) . Ver i f y a 72- hour l oad- car r y i ng capaci t y by a cer t i f i ed i ndependent l abor at or y.

Wher e duct wor k syst em cont ai ns heavy equi pment , excl udi ng ai r - di f f usi on devi ces and si ngl e- l eaf damper s, hang such equi pment i ndependent l y of t he duct wor k by means of r ods or angl es of s i zes adequat e t o suppor t t he l oad.

Cr oss- br ace hanger s t o pr ecl ude swayi ng bot h ver t i cal l y and l at er al l y.

3. 3. 10. 2 Installation

Ensur e hanger spaci ng gi ves a 20- t o- 1 saf et y f act or f or suppor t ed l oad.

Maxi mum l oad suppor t ed by any t wo f ast ener s i s 100 pounds.

I nst al l hanger s on bot h s i des of al l duct t ur ns, br anch f i t t i ngs, and transitions.

Fr i ct i on r od assembl i es ar e not accept abl e.

3. 3. 10. 3 St r ap- t ype Hangar s

Suppor t r ect angul ar duct s up t o 36- i nches by st r ap- t ype hanger s at t ached at not l ess t han t hr ee pl aces t o not l ess t han t wo duct sur f aces i n di f f er ent pl anes.

Per f or at ed st r ap hanger s ar e not accept abl e.

3. 3. 10. 4 Tr apeze Hangar s

Suppor t r ect angul ar duct i ng, 36- i nches and l ar ger , by t r apeze hanger s.

Suppor t duct s s i t uat ed i n uncondi t i oned ar eas and r equi r ed t o have i nsul at i on wi t h a vapor - seal ed f aci ng on t r apeze hanger s. Space hanger s f ar enough out f r om t he si de of t he duct t o per mi t t he duct i nsul at i on t o be pl aced on t he duct i nsi de t he t r apeze. Do not penet r at e t he vapor - seal ed f aci ng wi t h duct hanger s.

Wher e t r apeze hanger s ar e used, suppor t t he bot t om of t he duct on angl es s i zed as f ol l ows:

Apr i l 2019 Page 19 SECTI ON 23 31 13. 00 40

WI DTH OF DUCT,

I NCHES

MI NI MUM BOTTOM ANGLE SI ZE,

I NCHES

30 and smal l er 1- 1/ 4 by 1- 1/ 4 by 1/ 8

31 t o 48 1- 1/ 2 by 1- 1/ 2 by 1/ 8

49 t o 72 1- 1/ 2 by 1- 1/ 2 by 3/ 16

73 t o 96 2 by 2 by 1/ 4

97 and wi der 3 by 3 by 1/ 4

3. 3. 10. 5 Purlins

Do not suppor t duct i ng f r om r oof pur l i ns at poi nt s gr eat er t han one- si xt h of t he pur l i n span f r om t he r oof t r uss. Do not exceed 400 pounds l oad per hanger.

I f t he hanger l oad must exceed t he above l i mi t , pr ovi de r ei nf or ci ng of pur l i n( s) or addi t i onal suppor t beam( s) . When an addi t i onal beam i s used, have t he beam bear on t he t op chor d of t he r oof t r usses, and al so bear over t he gusset pl at es of t op chor d. St abi l i ze t he beam by connect i on t o r oof pur l i n al ong bot t om f l ange.

Pur l i ns used f or suppor t i ng f i r e- pr ot ect i on spr i nkl er mai ns, el ect r i cal l i ght i ng f i x t ur es, el ect r i cal power duct s, or cabl e t r ays ar e consi der ed f ul l y l oaded. Pr ovi de suppl ement al r ei nf or ci ng or auxi l i ar y suppor t st eel f or t hese pur l i ns when used t o suppor t duct wor k.

3. 3. 10. 6 Vi br at i on I sol at i on

I sol at e t he st r uct ur e f r om duct suppor t v i br at i on at poi nt s i ndi cat ed.

Ref er t o Sect i on 23 05 48. 00 40 VI BRATI ON AND SEI SMI C CONTROLS FOR HVAC

PI PI NG AND EQUI PMENT.

Pr ovi de vi br at i on i sol at or s i n di schar ge duct i ng syst em f or a di st ance not l ess t han 50- f eet beyond t he ai r handl i ng uni t . Coor di nat e def l ect i on of duct and equi pment mount i ngs.

3. 3. 11 Fl exi bl e Connect or s f or St eel Met al

Connect ai r - handl i ng equi pment , duct s cr ossi ng bui l di ng expansi on j oi nt s, and f an i nl et s and out l et s t o upst r eam and downst r eam component s wi t h t r eat ed woven- cl ot h connect or s.

I nst al l connect or s onl y af t er syst em f ans ar e oper at i ve and al l v i br at i on i sol at i on mount i ngs have been adj ust ed. When syst em f ans ar e oper at i ng, ensur e connect or s ar e f r ee of wr i nkl es caused by mi sal i gnment or f an r eact i on. Wi dt h of sur f ace i s cur vi l i near .

3. 3. 12 I nsul at i on Pr ot ect i on Angl es

Pr ovi de gal vani zed 20- gage sheet , f or med i nt o an angl e wi t h a 2- i nch exposed l ong l eg wi t h a 3/ 8- i nch st i f f eni ng br eak at out er edge, and wi t h a var i abl e conceal ed l eg, dependi ng upon i nsul at i on t hi ckness.

I nst al l angl es over al l i nsul at i on edges t er mi nat i ng by but t i…