20" X 18" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 22 5/8" X 20 5/8"] Material_Steel + Product Details Perfect Fit Height_16in RG1612AL Product Details Size 14

+ Product Details Perfect Fit & Easy Sizing - Designed for a 12" x 24" or 24" x 12" duct opening (measured at the opening)

actual front end outer dimensions are approximately 16 5/8" width X 22 5/8" height

+ Product Details Size - 16"w X 30"h is the size for the duct opening measurement only

Actual Filter Size – 23 3/4"w x 9 3/4" x 1"

+ Product Details Size - 14"w X 14"h is the size for the duct opening measurement only

20" X 18" Steel Return Air Filter Grille for 1" Filter Removable Frame [Outer Dimensions: 22 5 8" X 20 5 8"] Material_Steel + Product Details Perfect Fit Height_16in RG1612AL Product Details Size 14 + Product Details Perfect Fit & Easy Sizing Designed for a 12" x 24" or 24" x 12" duct opening (measured at the opening) actual front end outer dimensions are approximately 16 5 8" width X 22 5 8" height