12" X 24" Steel Return Air Filter Grille for 1" Filter - Removable Frame - Black - [Outer Dimensions: 14 5/8" X 26 5/8"] w24h24 + Product Details Size - 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size - 36"w X 16"h is the size for the duct opening measurement only

Adjustable airflow control - by rotating the middle disk

Whether you're restoring an old Victorian or craftsman style home

+ Product Description Introducing the Louver Floor Register from HVAC Premium – your gateway to enhanced home comfort and style

actual front end outer dimensions are approximately 22 5/8" width X 8 5/8" height

12" X 24" Steel Return Air Filter Grille for 1" Filter Removable Frame Black [Outer Dimensions: 14 5 8" X 26 5 8"] w24h24 + Product Details Size 4 X 12 Is CRFG2028 Width_14in + Product Details Size 36"w X 16"h is the size for the duct opening measurement only Adjustable airflow control by rotating the middle disk