18" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w34h34 + Product Details Perfect Fit Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

+ Product Details Perfect Fit & Easy Sizing - Designed for a 36" x 26" OR 26" x 36" duct opening (measured at the opening)

order a 20x14

+ Product Details Size – 34"w X 10"h is the size for the duct opening measurement only

+ Product Details Size – 8" x 18" or 18" x 8" is the size for the duct opening measurement only

Installation Location – Sidewall & ceiling

18" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w34h34 + Product Details Perfect Fit Compatible With Duct 7in Applications This sheet metal DDAG A 1212 + Product Details Perfect Fit & Easy Sizing Designed for a 36" x 26" OR 26" x 36" duct opening (measured at the opening) order a 20x14