Using PVC in Plenum

[Moonstone]

PVC conduits cannot be used in Plenum areas per National Electric Code. Does the mechanical code allow use of PVC insulation to insulate hydronic piping in plenum areas?

 

[trashcanman]

If the plenum is used for return air, all materials in the plenum shall be plenum rated. I don't think regular PVC is plenum rated. Other types of pvc might be.