6" x 20" or 20" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 8.5" X 22.5"] 12in diameter + Product Details Perfect Fit Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

+ Product Details Perfect Fit & Easy Sizing - Designed for a 26" x 20" OR 20" x 26" duct opening (measured at the opening)

+ Product Details Size - 25"w X 20"h is the size for the duct opening measurement only

+ Product Details Size – 14" x 30" or 30" x 14" is the size for the duct opening measurement only

+ Product Details Size – 12"w X 32"h is the size for the duct opening measurement only

+ Product Details Size – 20"w X 25"h is the size for the duct opening measurement only

6" x 20" or 20" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Aluminum White [Outer Dimensions: 8.5" X 22.5"] 12in diameter + Product Details Perfect Fit Compatible With Duct 7in Applications This sheet metal DDAG A 1212 + Product Details Perfect Fit & Easy Sizing Designed for a 26" x 20" OR 20" x 26" duct opening (measured at the opening) + Product Details Size 25"w X 20"h is the size for the duct opening measurement only