If the connection from the combustion air duct to the return plenum is visible inside the house, the fix for this situation is simple: have the combustion air duct disconnected from the furnace return ...

Many in our industry believe the duct material used in an installation determines how well the HVAC system moves air. Because of this mentality, flexible duct often gets a bad name. The issue isn’t ...

As many contractors attest, a supply air plenum is a sheet metal box attached to a furnace or air handler’s outlet and is used as a central manifold connector for other ductwork. As the air blows from ...