22" x 36" or 36" x 22" Cube Core Eggcrate Return Air Grille Compatible With Duct 8in + Product Details Size - Width_20in These won t hinder RFG1620 FBA

+ Product Details Size - 12"w X 34"h is the size for the duct opening measurement only

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

Actual Filter Size – 29 3/4"w x 11 3/4" x 1"

This versatile solution enhances air supply and adds a touch of class to your space

+ Product Details Size – 10" x 20" or 20" x 10" is the size for the duct opening measurement only

22" x 36" or 36" x 22" Cube Core Eggcrate Return Air Grille Compatible With Duct 8in + Product Details Size Width_20in These won t hinder RFG1620 FBA + Product Details Size 12"w X 34"h is the size for the duct opening measurement only + Product Details Size – 20"w X 36"h is the size for the duct opening measurement only