16" x 24" or 24" x 16" Cube Core Eggcrate Return Air Grille Aluminum Bar + Product Details Size –

+ Product Details Size – 25"w X 14"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 28 5/8" width X 12 5/8" height

Ideal for Walls & Ceilings: Designed for seamless installation in standard 12" X 8" duct openings

+ Product Details Size – 6" x 36" or 36" x 6" is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 14" x 24" OR 24" X 14" duct opening (measured at the opening)

16" x 24" or 24" x 16" Cube Core Eggcrate Return Air Grille Aluminum Bar + Product Details Size –+ Product Details Size 16" x 24" or 24" x 16" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 17. 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