36" x 25" Steel Return Air Filter Grill for 1" Filter Removable Face/Door Powder-Coated Actual Filter Size – 24

Actual Filter Size – 24 3/4"w x 33 3/4" x 1"

Its smooth

+ Product Details Perfect Fit & Easy Sizing - Designed for a 12" x 14" or 14" x 12" duct opening (measured at the opening)

+ Product Details Size - 14"w X 28"h X 2"d (for duct opening measurement only)

36" x 25" Steel Return Air Filter Grill for 1" Filter Removable Face/Door Powder-Coated Actual Filter Size – 24+ Product Details Size 36"w X 25"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 38 5 8" width X 27 5 8" height Actual Filter Size 35 3 4"w x 24 3 4" x 1" High Quality High quality solid stamped steel with counter sunk screw holes (screws included) and no sharp edges Installation Location Sidewall and ceiling Design Removable door face for easy filter change & cleaning uses a 1" thick filter.