24" X 20" Steel Return Air Filter Grille for 1" Filter - Fixed Hinged - [Outer Dimensions: 26 5/8" X 22 5/8"] Material_Aluminum + Product Details Size -

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

actual front end outer dimensions are approximately 32 5/8" width X 18 5/8" height

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

+ Product Details Size – 18"w X 36"h is the size for the duct opening measurement only

+ Product Details Size - 8"w X 14"h is the size for the duct opening measurement only

24" X 20" Steel Return Air Filter Grille for 1" Filter - Fixed Hinged - [Outer Dimensions: 26 5/8" X 22 5/8"] Material_Aluminum + Product Details Size -+ Product Details Size 24"w X 20"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 26 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