16" X 24" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 18 5/8" X 26 5/8"] w32h32 if your hole is 20"

if your hole is 20" wide by 14" tall

The 1/2" black insulation

+ Product Details Size – 20"w X 40"h is the size for the duct opening measurement only

The total outer size of this grille is the listed size plus 1

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16" X 24" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 18 5/8" X 26 5/8"] w32h32 if your hole is 20"+ Product Details Size 16"w X 24"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 18 5 8" width X 26 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