30" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w6h6 + Product Details Size – Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

+ Product Details Size – 30"w X 28"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 10" x 8" or 8" x 10" duct opening (measured at the opening)

+ Product Details Size – 16"w X 20"h is the size for the duct opening measurement only

Constructed from high-impact

+ Product Details Perfect Fit & Easy Sizing - Designed for a 32" x 36" Or 36" x 32" duct opening (measured at the opening)

30" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w6h6 + Product Details Size – Compatible With Duct 7in Applications This sheet metal DDAG A 1212 + Product Details Size – 30"w X 28"h is the size for the duct opening measurement only + Product Details Perfect Fit & Easy Sizing Designed for a 10" x 8" or 8" x 10" duct opening (measured at the opening)