PVC in plenum
PVC in plenum
(OP)
Hello,
I have a room with false ceiling, with HVAC ducted supply to diffusors but no ducted return: the plenum is used for this purpose.
NEC 300.22 (B) says i must use EMT tubes in this area, however i have PVC tubes that are marked "LSF, non-propagation of flame". Can i use those?
I have a room with false ceiling, with HVAC ducted supply to diffusors but no ducted return: the plenum is used for this purpose.
NEC 300.22 (B) says i must use EMT tubes in this area, however i have PVC tubes that are marked "LSF, non-propagation of flame". Can i use those?






RE: PVC in plenum
respectfully
RE: PVC in plenum
PVC is not rated, in a fire it generates phsogene gas. Firemen don't like that.
RE: PVC in plenum
RE: PVC in plenum
Alehman - what is the difference :) my electrical subcontractor likes 7" sewage pipes more than anything for infrastructure :)
RE: PVC in plenum
RE: PVC in plenum
Rigid PVC conduit is the same dimensions as scedule 40 PVC water pipe. The PVC conduit has an additive in the plastic formulation to make the conduit more resistant to sunlight.
respectfully
RE: PVC in plenum
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com