pvc duct work
pvc duct work
(OP)
Pardon my ignorance. Can you use standard pvc piping as ductwork in residential construction?
thanks in advance
tfl
thanks in advance
tfl
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RE: pvc duct work
RE: pvc duct work
Roger
RE: pvc duct work
PVC is not a good choice with respect to fire, and as I know PVC duct is not allowed by NFPA.
Ercan
RE: pvc duct work
2-2.2
The duct construction shall conform to the following applicable Sheet Metal and Air-Conditioning Contractors’ National Association, Inc. (SMACNA) standards:
(a) Accepted Industry Practice for Industrial Duct Construction
(b) Rectangular Industrial Duct Construction Standard
(c) Round Industrial Duct Construction Standard
(d) Thermoplastic Duct (PVC) Construction Manual
(e) Thermoset FRP Duct Construction Manual
...so it looks like NFPA is okay with it, so long as it conforms w/SMACNA.
RE: pvc duct work
RE: pvc duct work
I can't imagine that it is covered by code.
Even though you are not holding any pressure, PVC pipe is rated @ 74 F, so if it gets warm it's strength will go down so the pipe/duct will be sagging and bent all over the place. You also might pick up some smells and VOC's.
Since this is for ductwork, this is going to have to be pretty large pipe (unless it is some kind of high velocity systems) and there fore pretty expensive. Fittings are expensive too.
PVC is often perceived as "cheap" even though it is actually kind of expensive.
I have customers hook up chillers to PVC, and turn of the refrigeration system but not the pump. Lots of sagging pipe the next day.
Good Luck,
Clyde
RE: pvc duct work
RE: pvc duct work
ASTM E84 is why almost all Automatic Temperature Control installers only use plenum rated cable (teflon coated) even if the job doesn't have a plenum. Once bitten, twice shy so to speak.
I wouldn't use pvc, I would use flex duct if I needed the installation to have some sort of flexibility for the future.
RE: pvc duct work
TOK
RE: pvc duct work
RE: pvc duct work
It has to be cheap, all the contractors want to use miles of it...