30" x 30" Cube Core Eggcrate Return Air Grille Material_Steel + Product Details Size –

+ Product Details Size – 22"w X 24"h is the size for the duct opening measurement only

+ Product Details Size – 20"w X 4"h is the size for the duct opening measurement only

Upgrade your air distribution strategy today – invest in the efficiency and convenience of the 6" Butterfly Damper

+ Product Details Size - 26"w X 26"h is the size for the duct opening measurement only

30" x 30" Cube Core Eggcrate Return Air Grille Material_Steel + Product Details Size –+ Product Details Size 30" x 30" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 31. 75" X 31. 75". High Quality High quality, rust free aluminum construction with smooth finished edges and counter sunk screw holes (screws included); no sharp edges.. Installation Location sidewall and ceiling. Design Cubic core eggcrate design Offers highest airflow efficiency at almost 95%, reducing electric