36" X 22" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 38 5/8" X 24 5/8"] 18" Diameter actual front end outer dimensions

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

With a 5" diameter for the duct opening measurement

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actual front end outer dimensions are approximately 41

36" X 22" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 38 5/8" X 24 5/8"] 18" Diameter actual front end outer dimensions+ Product Details Size 36"w X 22"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 36 5 8" width X 24 5 8" height Actual Filter Size 35 3 4"w x 21 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.