12" X 18" Steel Return Air Filter Grille for 1" Filter - Fixed Hinged - [Outer Dimensions: 14 5/8" X 20 5/8"] w18h18 + Product Details Size -

+ Product Details Size - 30"w X 28"h is the size for the duct opening measurement only

please note that the total outer dimensions of the grille measure 10" in diameter

+ How To Measure A Grille Overall Size:

+ Product Details Size - 24"w X 2"h is the size for the duct opening measurement only

+Product Details Size – 2"h x 12"w is the size for the duct opening measurement only

12" X 18" Steel Return Air Filter Grille for 1" Filter - Fixed Hinged - [Outer Dimensions: 14 5/8" X 20 5/8"] w18h18 + Product Details Size -+ Product Details Size 12"w X 18"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 14 5 8" width X 20 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