20" X 20" Steel Return Air Filter Grille for 1" Filter - Fixed Hinged - [Outer Dimensions: 22 5/8" X 22 5/8"] Powder-Coated excluding the old vent cover

excluding the old vent cover

+ Product Details Size - 25"w X 24"h is the size for the duct opening measurement only

1/2" White insulation will give you a good R value of 3

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

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20" X 20" Steel Return Air Filter Grille for 1" Filter - Fixed Hinged - [Outer Dimensions: 22 5/8" X 22 5/8"] Powder-Coated excluding the old vent cover+ Product Details Size 20"w X 20"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 22 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