18" X 24" Steel Return Air Filter Grille for 1" Filter - Fixed Hinged - [Outer Dimensions: 20 5/8" X 26 5/8"] w20h20 this easy-to-install grille fits seamlessly

this easy-to-install grille fits seamlessly into any standard return filter opening

+ Product Details Size - 28"w X 12"h is the size for the duct opening measurement only

+ Product Details Size - 32"w X 34"h is the size for the duct opening measurement only

+ Product Details Size - The listed 8" diameter refers specifically to the size of the duct opening

+ Product Details Size - 18"w X 4"h is the size for the duct opening measurement only

18" X 24" Steel Return Air Filter Grille for 1" Filter - Fixed Hinged - [Outer Dimensions: 20 5/8" X 26 5/8"] w20h20 this easy-to-install grille fits seamlessly+ Product Details Size 18"w X 24"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 20 5 8" width X 26 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