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

+ Product Details Size – 6"w X 14"h is the size for the duct opening measurement only

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

Designed for a 1" thick filter

+ Product Details Size - 36"w X 14"h is the size for the duct opening measurement only

+ Product Details Size - 25"w X 25"h is the size for the duct opening measurement only

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