18" x 24" or 24" x 18" Cube Core Eggcrate Return Air Grille Color_R-4.2 Yellow Actual Filter Size – 31

Actual Filter Size – 31 3/4"w x 11 3/4" x 1"

+ Product Description Upgrade your ventilation with our premium grilles and registers

+ Product Details Perfect Fit & Easy Sizing - Designed for a 20" x 24" OR 24" x 20" duct opening (measured at the opening)

+ Product Description Upgrade your HVAC system with a high-quality aluminum return grille designed for a clean

18" x 24" or 24" x 18" Cube Core Eggcrate Return Air Grille Color_R-4.2 Yellow Actual Filter Size – 31+ Product Details Size 18" x 24" or 24" x 18" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 75" X 25. 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