10" X 36" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 12 5/8" X 38 5/8"] Grille + Product Details Size -

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

+ Product Details Size - 18"w X 32"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 14 5/8" width X 34 5/8" height

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10" X 36" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 12 5/8" X 38 5/8"] Grille + Product Details Size -+ Product Details Size 10"w X 36"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 12 5 8" width X 38 5 8" height Actual Filter Size 9 3 4"w x 35 3 4" x 1" High quality High quality solid stamped steel with counter sunk screw holes (screws included) and no sharp edges Location Sidewall and ceiling Design Removable door face for easy filter change & cleaning uses a 1" thick filter. Our filter