Testing cold air returns

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

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Book index entries

Testing Air Returns Air Return – in Ductwork – Testing Duct System Ducts – System for Air Conditioning

Text in the illustration

A
hold a tissue next to the cold air return
B
there should be enough suction to pull the tissue towards the return
if not, the ductwork may be obstructed or the filters (or coil) may be dirty

Generated explanation

Two panels demonstrate testing airflow at a cold air return grille with a tissue. Panel A shows a hand holding a tissue next to the grille. Panel B uses an arrow to indicate that suction should pull the tissue toward the return. The annotation identifies obstructed ductwork or dirty filters or a dirty coil as possible causes if there is insufficient suction; these conditions are not directly illustrated.