14" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible With Duct 8in With its compact size and 4 X 12 Is CRFG2028 Width_14in

With its compact size and high-quality materials

+ Product Details Perfect Fit & Easy Sizing - Designed for a 18" x 20" OR 20" x 18" duct opening (measured at the opening)

designed to optimize your air distribution

+ Product Details Size – 18" x 22" or 22" x 18" is the size for the duct opening measurement only

+ Product Details Size - 28"w X 34"h is the size for the duct opening measurement only

14" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible With Duct 8in With its compact size and 4 X 12 Is CRFG2028 Width_14in With its compact size and high quality materials + Product Details Perfect Fit & Easy Sizing Designed for a 18" x 20" OR 20" x 18" duct opening (measured at the opening)