10" X 8" 3-Way Air Supply Grille – Steel HVAC Vent Cover with Damper, Wall/Ceiling Register, White Return Grille Ideal for Walls & Ceilings:

Ideal for Walls & Ceilings: Designed for seamless installation in standard 18" X 12" duct openings

Actual Filter Size – 33 3/4"w x 33 3/4" x 1"

See our separate listing for Butterfly Dmaper to Control Airflow

+ Product Details Size - 6"w X 20"h is the size for the duct opening measurement only

adds a touch of sophistication to any room

10" X 8" 3-Way Air Supply Grille – Steel HVAC Vent Cover with Damper, Wall/Ceiling Register, White Return Grille Ideal for Walls & Ceilings:+ Product Details Outer dimensions: 11. 75"W x 9. 75"H fits a 10" 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