18" X 18" Steel Return Air Filter Grille for 1" Filter - Fixed Hinged - [Outer Dimensions: 20 5/8" X 20 5/8"] Brown With a 8" diameter for

With a 8" diameter for the duct opening measurement

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+ Product Details Size – 18"w X 10"h is the size for the duct opening measurement only

+ Product Details Size – 10" X 4" is the size for the duct opening (floor/vent hole) measurement only

Filter Size - 9

18" X 18" Steel Return Air Filter Grille for 1" Filter - Fixed Hinged - [Outer Dimensions: 20 5/8" X 20 5/8"] Brown With a 8" diameter for+ 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