18" x 30" or 30" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w32h32 this easy-to-install grille fits seamlessly 4 X 12 Is CRFG2028 Width_14in

this easy-to-install grille fits seamlessly into any standard return filter opening

+ Product Details Size – 36"w X 20"h is the size for the duct opening measurement only

much more than required 700 PSI for R410

No Sharp Surface Edges

actual front end outer dimensions are approximately 27 5/8" width X 36 5/8" height

18" x 30" or 30" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w32h32 this easy to install grille fits seamlessly 4 X 12 Is CRFG2028 Width_14in this easy to install grille fits seamlessly into any standard return filter opening + Product Details Size – 36"w X 20"h is the size for the duct opening measurement only