ss ductwork pics

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This is a few pics of SS ductwork 16ga. for a humidifer system in a hospital in my area.It,s 108"x42" did it with a HH140,Tri mix gas,030 wire.All of it being welded inside, plenty of room to just get in and go not worth doing outside tight quarters where it was installed. Attached Images
Reply:Originally Posted by admsweldingThis is a few pics of SS ductwork 16ga. for a humidifer system in a hospital in my area.It,s 108"x42" did it with a HH140,Tri mix gas,030 wire.All of it being welded inside, plenty of room to just get in and go not worth doing outside tight quarters where it was installed.
Reply:Yes on acess hole,smacna spec.,the hole gets a flat plate patch lap welded all around, inside had 1/2"ss stiffiner pipes welded in.If i where guess 6"static test.Good questions.
Reply:6" is a LOT of static. hope that duct stays rectangular when the fan comes on...108" wide is a lot of flat spot for that pressure to push against....