18" X 36" Steel Return Air Filter Grille for 1" Filter - Fixed Hinged - [Outer Dimensions: 20 5/8" X 38 5/8"] sidewall + Product Details Size -

+ Product Details Size - 12"w X 14"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 28 5/8" width X 18 5/8" height

+ Product Details Size - 8"w X 30"h is the size for the duct opening measurement only

Please check the measuring guide to ensure a proper fit

+ Product Details Size – 14"w X 14"h is the size for the duct opening measurement only

18" X 36" Steel Return Air Filter Grille for 1" Filter - Fixed Hinged - [Outer Dimensions: 20 5/8" X 38 5/8"] sidewall + Product Details Size -+ Product Details Size 18"w X 36"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 20 5 8" width X 338 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