18" X 8" 3-Way Air Supply Grille – Steel HVAC Vent Cover with Damper, Wall/Ceiling Register, White 18" Diameter /* Adding space between bullet

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+ Product Details Size - 22"w X 26"h is the size for the duct opening measurement only

provides a modern look and quiet operation due to its half-inch by half-inch cube design

+ Product Details Size - The listed 5" diameter refers specifically to the size of the duct opening

Actual Filter Size – 24 3/4"w x 29 3/4" x 1"

18" X 8" 3-Way Air Supply Grille – Steel HVAC Vent Cover with Damper, Wall/Ceiling Register, White 18" Diameter /* Adding space between bullet+ 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