12" X 20" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 14 5/8" X 22 5/8"] w20h20 the gap will expand and

the gap will expand and retract to meet perfect air supply needed

+ Product Details Size - 10"w X 24"h is the size for the duct opening measurement only

By means of the smooth surface

Pressure rating: 2300 to 6500 psi

12" X 20" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 14 5/8" X 22 5/8"] w20h20 the gap will expand and+ 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 Location Sidewall and ceiling Design Removable door face for easy filter change & cleaning uses a 1" thick filter. Our filter