12" X 12" Steel Return Air Filter Grille for 1" Filter - Removable Frame - * Filter Included *[Outer Dimensions: 14 5/8" X 14 5/8"] Insulated Line actual front end outer dimensions

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

actual front end outer dimensions are approximately 36 5/8" width X 38 5/8" height

this grille offers durability and resistance to rust and corrosion

+ Product Details Size - 24"w X 4"h is the size for the duct opening measurement only

12" X 12" Steel Return Air Filter Grille for 1" Filter - Removable Frame - * Filter Included *[Outer Dimensions: 14 5/8" X 14 5/8"] Insulated Line actual front end outer dimensions+ Product Details Size 12"w X 12"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 14 5 8" width X 14 5 8" height Actual Filter Size 11 3 4"w x 11 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.