28" X 12" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 30 5/8" X 14 5/8"] w36h36 of up to 300m3/h

of up to 300m3/h

+ Product Details Size - 26"w X 18"h is the size for the duct opening measurement only

4" X 14" Is The Size For The Duct Opening (floor/vent hole) Measurement Only

+ Product Details Size - 10"w X 6"h is the size for the duct opening measurement only

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28" X 12" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 30 5/8" X 14 5/8"] w36h36 of up to 300m3/h+ Product Details Size 28"w X 12"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 30 5 8" width X 14 5 8" height Actual Filter Size 27 3 4"w x 11 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.