20" X 24" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 22 5/8" X 26 5/8"] w26h26 display === '') { dd

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The powder-coated finish ensures a sleek look while protecting the grille from wear and tear

+ Product Details Size - 12"w X 22"h is the size for the duct opening measurement only

Whilst the maximum pressure for R410 is 700 PSI

+ Product Details Size - 22"w X 4"h is the size for the duct opening measurement only

20" X 24" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 22 5/8" X 26 5/8"] w26h26 display === '') { dd+ Product Details Size 20"w X 24"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 22 5 8" width X 26 5 8" height Actual Filter Size 19 3 4"w x 23 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.