12" X 20" Steel Return Air Filter Grille for 1" Filter - Removable Frame - * Filter Included * [Outer Dimensions: 14 5/8" X 22 5/8"] Aluminum - Cube Core actual front end outer dimensions

actual front end outer dimensions are approximately 18 5/8" width X 8 5/8" height -

Refrigerant - 1/2" White Insulation - 50' Long

Actual Filter Size – 35 3/4"w x 33 3/4" x 1"

the actual front end outer dimensions are 6" in diameter

actual front end outer dimensions are approximately 30 5/8" width X 12 5/8" height

12" X 20" Steel Return Air Filter Grille for 1" Filter - Removable Frame - * Filter Included * [Outer Dimensions: 14 5/8" X 22 5/8"] Aluminum - Cube Core actual front end outer dimensions+ Product Details Size 12"w X 20"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 14 5 8" width X 22 5 8" height Actual Filter Size 11 3 4"w x 19 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.