18" X 30" Steel Return Air Filter Grille for 1" Filter - Fixed Hinge - [Outer Dimensions: 20 5/8" X 32 5/8"] w28h28 + Product Details Size -

+ Product Details Size - 18"w X 28"h is the size for the duct opening measurement only

+ Product Details Size - 28"w X 28"h is the size for the duct opening measurement only

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

actual front end outer dimensions are approximately 31

+ Product Details Size – 12" x 30" or 30" x 12" is the size for the duct opening measurement only

18" X 30" Steel Return Air Filter Grille for 1" Filter - Fixed Hinge - [Outer Dimensions: 20 5/8" X 32 5/8"] w28h28 + Product Details Size -+ Product Details Size 18"w X 30"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 20 5 8" width X 32 5 8" height. High Quality high quality solid stamped steel with counter sunk screw holes (screws included) and no sharp edges Installation Location Ceiling Design Fixed hinged for easy filter change & cleaning uses a 1" thick filter. Our filter grille latch is easy to use on your fingers and