20" X 22" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 22 5/8" X 24 5/8"] fixed bar + Product Details Size -

+ Product Details Size - 36"w X 4"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 16" x 20" OR 20" X 16" duct opening (measured at the opening)

R Value Rating of Insulation - R3

Produced in accordance with ISO 9001-2008 Quality Management System

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20" X 22" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 22 5/8" X 24 5/8"] fixed bar + Product Details Size -+ Product Details Size 20"w X 22"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 22 5 8" width X 24 5 8" height Actual Filter Size 19 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.