What Is a Duct Board Plenum

Duct board consists of compressed fiberglass backed with a foil vapor barrier. The insulating qualities of compressed fiberglass reduces the temperature loss from air moving through the plenum and stops condensation from forming on the exterior surface of the duct plenum.

Can you use duct board as a plenum?

The plenum is usually made from sheet metal and is connected to the supply outlet of an HVAC system. … The difference between the listings is that tapes that meet both listings (UL 181A-P/B-FX) can be used on rigid fiberglass duct board, flexible air duct and sheet metal.

What is the purpose of a plenum?

Plenum boxes are usually situated on either side of the fan or heat exchanger and have the important function of bringing in, distributing, and removing air. They are the air’s first stop after being heated or cooled and its last stop before going back into your AC, heat pump, or furnace.