18" X 20" Steel Return Air Filter Grille for 1" Filter - Fixed HInged - [Outer Dimensions: 20 5/8" X 22 5/8"] Ceiling + Product Details Size -

+ Product Details Size - 8"w X 16"h is the size for the duct opening measurement only

+ Product Details Size - 34"w X 28"h is the size for the duct opening measurement only

Design – Fixed hinged for easy filter change & cleaning - uses a 1" thick filter

+ Product Details Size – 40"w X 20"h is the size for the duct opening measurement only

18" X 20" Steel Return Air Filter Grille for 1" Filter - Fixed HInged - [Outer Dimensions: 20 5/8" X 22 5/8"] Ceiling + Product Details Size -+ Product Details Size 18"w X 20"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 20 5 8" width X 22 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