6" x 20" or 20" x 6" Cube Core Eggcrate Return Air Grille Color_Aluminum + Product Description Maximize the

+ Product Description Maximize the efficiency of your ventilation system with our top-of-the-line HVAC grilles and registers

+ Product Details Size - 28"w X 8"h is the size for the duct opening measurement only

offering maximum flexibility

Built-In Locking System – Comes with a permanently attached eight-tumbler lock and a supplied key for added security

+ Product Details Size – 12"w X 32"h is the size for the duct opening measurement only

6" x 20" or 20" x 6" Cube Core Eggcrate Return Air Grille Color_Aluminum + Product Description Maximize the+ Product Details Size 6" x 20" or 20" x 6" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 7. 75" X 21. 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