According to Elements, in 2020 more than half of U.S. homes had forced-air furnaces. Of the more than half ... made of galvanized steel and extends through the roof or a wall. High-efficiency furnaces ...

Return air vents, strategically placed in your ceiling, floor or wall, connect to ductwork in your forced air HVAC system. They draw air from a room to the furnace or air conditioner. where it’s ...