28" X 30" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 30 5/8" X 32 5/8"] Filter Grille Mounted with a frame and

Mounted with a frame and bayonet joint

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Actual Filter Size – 35 3/4"w x 25 3/4" x 1"

Actual Filter Size – 23 3/4"w x 29 3/4" x 1"

And is classified as Class 1 Fire Proof - B1

28" X 30" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 30 5/8" X 32 5/8"] Filter Grille Mounted with a frame and+ Product Details Size 28"w X 30"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 30 5 8" width X 32 5 8" height Actual Filter Size 27 3 4"w x 29 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.