18" X 16" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 20 5/8" X 18 5/8"] Color_R-4.2 Yellow The total outer size of Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

The total outer size of this grille is the listed size plus 2 and 5/8"

Actual Filter Size – 29 3/4"w x 5 3/4" x 1"

+ Product Details Size - 25"w X 16"h is the size for the duct opening measurement only

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

875" width X 21

18" X 16" Steel Return Air Filter Grille for 1" Filter Removable Frame [Outer Dimensions: 20 5 8" X 18 5 8"] Color_R 4.2 Yellow The total outer size of Compatible With Duct 7in Applications This sheet metal DDAG A 1212 The total outer size of this grille is the listed size plus 2 and 5 8" Actual Filter Size – 29 3 4"w x 5 3 4" x 1"