26" X 36" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 28 5/8" X 38 5/8"] Grilles + Product Details Size -

+ Product Details Size - 12"w X 32"h is the size for the duct opening measurement only

+ Product Details Size – 25"w X 6"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 10" x 20" duct opening (measured at the opening)

actual front end outer dimensions are approximately 9

26" X 36" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 28 5/8" X 38 5/8"] Grilles + Product Details Size -+ Product Details Size 26"w X 36"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 28 5 8" width X 26 5 8" height Actual Filter Size 25 3 4"w x 35 3 4" x 1" High quality High quality solid stamped steel with counter sunk screw holes (screws included) and no sharp edges Design Removable door face for easy filter change & cleaning uses a 1" thick filter. Our filter grille latch is easy to use on