20" X 16" Steel Return Air Filter Grille for 1" Filter - Removable Frame - Black - [Outer Dimensions: 22 5/8" X 18 5/8"] w20h20 while the ingenious dial-controlled damper

while the ingenious dial-controlled damper empowers you to effortlessly regulate airflow using your foot

actual front end outer dimensions are approximately 14 5/8" width X 28 5/8" height

Actual Filter Size – 15 3/4"w x 15 3/4" x 1"

+ Product Details Size - 10"w X 12"h is the size for the duct opening measurement only

+ Product Details Size - 28"w X 16"h is the size for the duct opening measurement only

20" X 16" Steel Return Air Filter Grille for 1" Filter - Removable Frame - Black - [Outer Dimensions: 22 5/8" X 18 5/8"] w20h20 while the ingenious dial-controlled damper+ Product Details Size 20"w X 16"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 22 5 8" width X 18 5 8" height Actual Filter Size 19 3 4"w x 15 3 4" x 1" 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.