18" x 26" or 26" x 18" Cube Core Eggcrate Return Air Grille w20h20 Ideal for Walls & Ceilings:

Ideal for Walls & Ceilings: Designed for seamless installation in standard 18" X 10" duct openings

this grille enhances air circulation

875" width X 21

+ Product Details Size - 16"w X 24"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 22 5/8" width X 12 5/8" height -

18" x 26" or 26" x 18" Cube Core Eggcrate Return Air Grille w20h20 Ideal for Walls & Ceilings:+ Product Details Size 18" x 26" or 26" x 18" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 75" X 27. 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