10" X 34" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 12 5/8" X 36 5/8"] Powder-Coated + Product Details Size -

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

actual front end outer dimensions are approximately 28 5/8" width X 18 5/8" height

4" X 10" Is The Size For The Duct Opening (floor/vent hole) Measurement Only

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

+ Product Details Size – 6" x 16" or 16" x 6" is the size for the duct opening measurement only

10" X 34" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 12 5/8" X 36 5/8"] Powder-Coated + Product Details Size -+ Product Details Size 10"w X 34"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 12 5 8" width X 36 5 8" height Actual Filter Size 9 3 4"w x 33 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