Flame Spread & Smoke Development Rated PVC products are rated for high buildings and air plenums as mandated by the National Building Code. Suitable for use in noncombustible environments, which permits our Flame Spread & Smoke Development Rated PVC Products to be installed in High Buildings and Air Return Plenums in accordance with local Codes. And in addition to its flame and smoke attributes, our Flame Spread & Smoke Development Rated PVC Products deliver all the performance advantages you’d expect from thermoplastic piping. Fittings are certified by CSA to CSA B181.2, and listed to exhibit to Flame and Smoke values as per ULC S102.2.