Air Duct Materials - Sheet Metal, Fiberglass Duct Board, Flexible Ducting

Fiberglass duct board. Often used to form large-section trunk lines that feed smaller ducts, fiberglass duct board is insulated (around R4.5 for 1-in.-thick board) and has a smooth finish to promote good air flow.

Building cavities. The open spaces between studs and joists are often used as part of a home's ductwork system. Taking advantage of building cavities is an attractive option for builders, because it saves money. While this type of duct can be fairly airtight (little or no leakage), the wood and wallboard inner surfaces are coarse enough to impede air flow.

Flexible non-metallic ducts. These large-diameter, wire-reinforced ducts can be used in long lengths, and have enough flexibility to snake around obstacles. Flex ducts are popular in attics and in any cramped space. Long lengths eliminate the need for many joints, but leaks can occur where flex duct joins sheet metal registers or other types of ductwork. Flex ducts can be torn, cut and crushed, so careful handling is important.

Sheet metal. Made from galvanized steel, these ducts can be rectangular or round. One duct section usually slides into another. Leaks typically occur where sections join.

Dr. Energy Saver can help you with any type of ducting you have.  We can do duct leakage testing to find air leaks in your ducts, and then do the air sealing to improve on their home energy savings.

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