10" x 36" or 36" x 10" Cube Core Eggcrate Return Air Grille w30h30 This versatile diffuser is available

This versatile diffuser is available in 1-way

+ Product Details Size - 26"w X 22"h is the size for the duct opening measurement only

75"H – fits a 18" X 4" duct opening

[Outer Dimensions: 20

during winter

10" x 36" or 36" x 10" Cube Core Eggcrate Return Air Grille w30h30 This versatile diffuser is available+ Product Details Size 10" x 36" or 36" x 10" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 11. 75" X 37. 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