32" x 20" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w36h36 Ideal for Walls & Ceilings: 4 X 12 Is CRFG2028 Width_14in

Ideal for Walls & Ceilings: Designed for seamless installation in standard 14" X 10" duct openings

+ Product Details Size - 18"w X 20"h is the size for the duct opening measurement only

+ Product Spec Sheet Aluminum Return Grille Spec Sheet

+ Product Details Size – 20" x 36" or 36" x 20" is the size for the duct opening measurement only

+ Product Details Size – 8"w X 20"h is the size for the duct opening measurement only

32" x 20" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w36h36 Ideal for Walls & Ceilings: 4 X 12 Is CRFG2028 Width_14in Ideal for Walls & Ceilings: Designed for seamless installation in standard 14" X 10" duct openings + Product Details Size 18"w X 20"h is the size for the duct opening measurement only