Hvac Elima-Draft Elima-Draft Magnetic Register/Vent Covers | 24″ X 24″ Air Deflector Cover W/ 45° Deflector, Fits 1″ Grid

Close Off Diffusers Where Airflow Is Not Needed. Supply Other Areas With Increased A/C Or Forced Hot Air. Place Over Diffusers During Hvac Duct Cleaning To Trap Falling Dirt And Debris.