The distribution system is made of an HVAC ductwork air return supply, filters, dampers and registers. There are numerous methods of designing a ducted heating or cooling system. Care is taken when ...

This is key because a dusty return does not automatically ... Cunniffe explains. "[Since] HVAC systems push air through the air ducts that run throughout the home in walls, ceilings, and floors ...

The duct dimension is the outside diameter (OD). Air grilles are usually made of aluminum, bronze, steel, or stainless steel and then polished, anodized, or treated with enamel colors. There are many ...