12" x 36" or 36" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 14" Round Duct Pipe + Product Details Perfect Fit Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

+ Product Details Perfect Fit & Easy Sizing - Designed for a 6" x 18" or 18" x 6" duct opening (measured at the opening)

+ Product Details Perfect Fit & Easy Sizing - Designed for a 22" x 10" OR 10" x 22" duct opening (measured at the opening)

+ Product Details Size - 28"w X 8"h is the size for the duct opening measurement only

+ Product Details Size – 12" x 14" or 14" x 12" is the size for the duct opening measurement only

+ Product Spec Sheet Return Air Grille Spec Sheet

12" x 36" or 36" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 14" Round Duct Pipe + Product Details Perfect Fit Compatible With Duct 7in Applications This sheet metal DDAG A 1212 + Product Details Perfect Fit & Easy Sizing Designed for a 6" x 18" or 18" x 6" duct opening (measured at the opening) + Product Details Perfect Fit & Easy Sizing Designed for a 22" x 10" OR 10" x 22" duct opening (measured at the opening)