18" X 6" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 20 5/8" X 8 5/8"] Return Grille And is classified as Class

And is classified as Class 1 Fire Proof - B1

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these pipes offer easy handling

our coils offer from 2300 to 6500 PSI

+ Product Details Size - 25"w X 36"h is the size for the duct opening measurement only

18" X 6" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 20 5/8" X 8 5/8"] Return Grille And is classified as Class+ Product Details Size 18"w X 6"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 20 5 8" width X 8 5 8" height Actual Filter Size 17 3 4"w x 5 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