18" X 12" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 20 5/8" X 14 5/8"] Width_20in Powder-coat finish – smooth

Powder-coat finish – smooth

If your hole is 14" wide by 20" tall

Insulation – A thick blanket of fiberglass insulation provides you with an R-Value of 4

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18" X 12" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 20 5/8" X 14 5/8"] Width_20in Powder-coat finish – smooth+ Product Details Size 18"w X 12"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 20 5 8" width X 14 5 8" height High Quality high quality solid stamped steel with counter sunk screw holes (screws included) and no sharp edges Installation Location sidewall and ceiling Design removable door face for easy filter change & cleaning uses a 1" thick filter. Our filter grille latch is easy to use on