30" X 12" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 32 5/8" X 14 5/8"] w36h36 If your duct opening is

If your duct opening is 14 inches in diameter

Crafted from solid stamped steel

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The total outer size of this grille is the listed size plus 2 and 5/8"

30" X 12" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 32 5/8" X 14 5/8"] w36h36 If your duct opening is+ Product Details Size 30"w X 12"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 32 5 8" width X 14 5 8" height Actual Filter Size 29 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.