Is PVC allowed in return air plenum?
Fact: PVC should not be installed in a plenum. It is classified as a combustible material per ASTM E 136. Fact: Cast iron is a non-combustible product, which can be installed in a return air plenum.
What is plenum rated pipe?
Plenum ratings Model codes restrict the surface burning characteristics of the materials that can be installed in air plenums. Various tests are used to evaluate the surface burning characteristics of constructions materials.
Can you run plumbing through a cold air return?
Plumbing pipes can run perpendicular through a cold air return, it is not a good idea to run a toilet pipe through if it over flows and follows the pipe down. The only pipe you can’t install in a cold air return is a gas pipe.
Is fiberglass pipe insulation plenum rated?
Plenum wrap is a blanket insulation that has a robust fire rating and is commonly used in plenum spaces. It is currently the only preformed fiber glass pipe insulation that is listed and labeled as meeting 25/50 in an assembly over combustible materials.
Can you run CPVC in a plenum ceiling?
CPVC piping for potable hot and cold water distribution systems is recognized in all model plumbing codes. Also, CPVC plumbing pipe is safe for installation in return air plenums; however, the installation must be approved by the local jurisdiction.
Is PVC fire retardant?
PVC is inherently a self-extinguishing fire retardant material due to the abundance of chlorine in its formulation, with burning characteristics closer to that of paper, wood and straw. These materials have a very high risk of igniting and will maintain the fire.
Can you run plumbing through ductwork?
So, can your plumbing run through ductwork? The short answer: no. Any ducting system has the chance to run excessively hot or cold air. With that in mind, there is always a chance that hot air may cause damage to your pipes.
Where do cold air returns go?
Cold air returns are located on interior walls in a home, typically close to the floor or low on the wall. You want to make sure that cold air return vents are not blocked or covered by furniture so that your home can get proper air circulation.
What is a 25 50 fire rating?
A product with a flame spread rating of 25 and a smoke developed rating of 50 is commonly referred to as a 25/50 rated material. ASTM E84 is considered to be a medium-scale test and has been widely adopted for use by the building code authorities to regulate the use of interior finish materials.
Is CPVC fire-resistant?
CPVC is self-extinguishing and has high ignition resistance, meaning there needs to be an extreme amount of heat for the material to combust. FlowGuard CPVC has a flash ignition temperature of 482°C, whereas PPR has a flash ignition temperature of 340°C.
