24" x 36" or 36" x 24" Cube Core Eggcrate Return Air Grille Powder-Coated + Product Details Size –

+ Product Details Size – 12" x 12" is the size for the duct opening measurement only

Built with rust-resistant aluminum and a scratch-resistant powder-coated finish

+ Product Details Perfect Fit & Easy Sizing - Designed for a 12" x 36" or 36" x 12" duct opening (measured at the opening)

Ideal for Walls & Ceilings: Designed for seamless installation in standard 14" X 12" duct openings

24" x 36" or 36" x 24" Cube Core Eggcrate Return Air Grille Powder-Coated + Product Details Size –+ Product Details Size 24" x 36" or 36" x 24" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 25. 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