18" X 8" 3-Way Air Supply Grille – Steel HVAC Vent Cover with Damper, Wall/Ceiling Register, White Color_R-4.2 Yellow 75"H – fits a 18"

75"H – fits a 18" X 4" duct opening

For a visual guide on how to measure your vent hole before ordering a grille

our Circular Air Supply Valves are ideal for low and medium pressure ventilation air conditioning systems

or office environments

18" X 8" 3-Way Air Supply Grille – Steel HVAC Vent Cover with Damper, Wall/Ceiling Register, White Color_R-4.2 Yellow 75"H – fits a 18"+ Product Details Outer dimensions: 19. 75"W x 9. 75"H fits a 18" X 8" duct opening Durable stamped steel construction ensures long lasting performance Designed for sidewall and ceiling installation with included screws Multi shutter damper with easy lever for precise airflow control Smooth powder coated white finish for a sleek look and scratch resistance + Product Description Maximize your homes airflow with this premium Air Supply Grille air supply