Duct Sealing

According to ENERGY STAR, about 20% of the air that moves through your duct system is lost due to leaks and poorly sealed connections. While some ducts may not be accessible since they are behind walls or in floors, all exposed ducts in a non-conditioned space may be improved by using a duct sealant. Mastic is the type of sealant preferred instead of the foil tape that is often seen on duct connections.