Air return outside room

Air Conditioning and Heat Pumps · Duct System · printed page 223 (PDF page 224)

Book index entries

Air Conditioning – Air Return Outside Room Air Return – Outside Room for Air Conditioning Duct System Ducts – System for Air Conditioning

Text in the illustration

when the air return is outside the bedroom (e.g., in the hallway) the door should be trimmed at the bottom to provide at least a 3/4" air circulation gap
if the air can't circulate, the room becomes pressurized and won't cool down because it can't accept any more cool air
trim here
supply register

Generated explanation

The illustration shows a bedroom with a floor supply register and a return-air grille outside the room, visible through the open doorway. Arrows and a dashed line at the bottom of the door indicate where to trim the door to create an air circulation gap. The annotation calls for at least a 3/4-inch gap when the return is outside the bedroom, such as in a hallway. It explains that an inadequate return-air path can pressurize the room and prevent effective cooling by restricting additional cool supply air.

Related illustrations

0797

Air return outside room

· p. 131

The illustration shows a bedroom with a floor-mounted heat register and a return-air grille outside the room, visible through the open doorway. An arrow and dashed line at the door bottom indicate where to trim the door

0790

Supply air registers, diffusers and grilles

· p. 130

The illustration identifies three types of forced-air duct outlets and inlets: a grille, a register, and a diffuser. The rectangular grille has fixed parallel slats and is identified as typical for air returns and not ad