10" X 18" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 12 5/8" X 20 5/8"] flat stamped steel Filter Size - 20

Filter Size - 20

& EN 13180 standards

+ Product Details Size - 16"w X 34"h is the size for the duct opening measurement only

ventilation

+ Product Details Size – 16"w X 6"h is the size for the duct opening measurement only

10" X 18" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 12 5/8" X 20 5/8"] flat stamped steel Filter Size - 20+ Product Details Size 10"w X 18"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 12 5 8" width X 20 5 8" height Actual Filter Size 9 3 4"w x 17 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. Our