36" x 36" Cube Core Eggcrate Return Air Grille flat stamped steel + Product Details Size –

+ Product Details Size – 16" x 18" or 18" x 16" is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 32" x 32" duct opening (measured at the opening)

Ideal for Walls & Ceilings: Designed for seamless installation in standard 16" X 16" duct openings

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36" x 36" Cube Core Eggcrate Return Air Grille flat stamped steel + Product Details Size –+ Product Details Size 36" x 36" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 37. 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 electric