14" X 20" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 16 5/8" X 22 5/8"] Copper Coil you can attain the diameter

you can attain the diameter of the vent

This simple adjustment reduces HVAC strain

Pressure Rating: 2100 to 7000 PSI

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

+ Product Details Size - 28"w X 16"h is the size for the duct opening measurement only

14" X 20" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 16 5/8" X 22 5/8"] Copper Coil you can attain the diameter+ Product Details Size 14"w X 20"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 16 5 8" width X 22 5 8" height Actual Filter Size 13 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.