20" X 40" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 22 5/8" X 42 5/8"] 8in diameter + Product Details Size –

+ Product Details Size – 16"w X 24"h is the size for the duct opening measurement only

+ Product Details Size – 22"w X 25"h is the size for the duct opening measurement only

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+ Product Details Size - 24"w X 32"h is the size for the duct opening measurement only

And Meets/Beats ASTM B280 Standard

20" X 40" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 22 5/8" X 42 5/8"] 8in diameter + Product Details Size –+ Product Details Size 20"w X 40"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 22 5 8" width X 42 5 8" height High Quality high quality solid stamped steel with counter sunk screw holes (screws included) and no sharp edges Installation Location Sidewall & ceiling Design removable frame for easy filter change & cleaning uses a 1" thick filter. Our filter grille latch is easy to use on your