30" X 6" 2-Way Air Supply Grille – Steel HVAC Vent Cover with Damper, Wall/Ceiling Register, White w10h10 10"w X 2"h Is The

10"w X 2"h Is The Size For The Duct Opening Measurement Only

+ Product Details Size - 36"w X 12"h is the size for the duct opening measurement only

Actual Filter Size – 21 3/4"w x 29 3/4" x 1"

See our separate listing for Butterfly Dmaper to Control Airflow

also called T-Bar systems

30" X 6" 2-Way Air Supply Grille – Steel HVAC Vent Cover with Damper, Wall/Ceiling Register, White w10h10 10"w X 2"h Is The+ Product Details Outer dimensions: 31. 75"W x 7. 75"H fits a 30" X 6" 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