18" X 12" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 20 5/8" X 14 5/8"] Width_20in If your hole is 14"

If your hole is 14" wide by 20" tall

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+ Product Details Size - 36"w X 10"h is the size for the duct opening measurement only

Every grille has a front end frame that will overlap at the wall joint

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

18" X 12" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 20 5/8" X 14 5/8"] Width_20in If your hole is 14"+ 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