18" X 28" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 20 5/8" X 30 5/8"] Aluminum - Cube Core We carry sizes the big

We carry sizes the big box stores don't

Measure the size of the air duct/drywall opening

much more than the required 700 psi for r410

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

+ Product Details Size - 20"w X 34"h is the size for the duct opening measurement only

18" X 28" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 20 5/8" X 30 5/8"] Aluminum - Cube Core We carry sizes the big+ Product Details Size 18"w X 28"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 20 5 8" width X 30 5 8" height Actual Filter Size 17 3 4"w x 27 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.