8" X 36" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 10 5/8" X 38 5/8"] White + Product Details Perfect Fit 4 X 12 Is CRFG2028 Width_14in

+ Product Details Perfect Fit & Easy Sizing - Designed for a 10" x 10" duct opening (measured at the opening)

+ Product Details Size - 22"w X 16"h is the size for the duct opening measurement only

+ Product Details Size – 24"w X 30"h is the size for the duct opening measurement only

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+ Product Details Size - 24"w X 12"h is the size for the duct opening measurement only

8" X 36" Steel Return Air Filter Grille for 1" Filter Removable Frame [Outer Dimensions: 10 5 8" X 38 5 8"] White + Product Details Perfect Fit 4 X 12 Is CRFG2028 Width_14in + Product Details Perfect Fit & Easy Sizing Designed for a 10" x 10" duct opening (measured at the opening) + Product Details Size 22"w X 16"h is the size for the duct opening measurement only