16" X 20" Steel Return Air Filter Grille for 1" Filter - Fixed Hinged - [Outer Dimensions: 18 5/8" X 22 5/8"] 18" Diameter 3 * insulation density is

3 * insulation density is 30kgs/cbm = 0

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actual front end outer dimensions are approximately 12 5/8" width X 12 5/8" height

+ Product Details Size – 20"w X 50"h is the size for the duct opening measurement only

16" X 20" Steel Return Air Filter Grille for 1" Filter - Fixed Hinged - [Outer Dimensions: 18 5/8" X 22 5/8"] 18" Diameter 3 * insulation density is+ Product Details Size 16"w X 20"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 18 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