8" x 18" or 18" x 8" Cube Core Eggcrate Return Air Grille Black Designed for a 1" thick

Designed for a 1" thick filter

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making it a reliable choice for improving indoor air quality

8" x 18" or 18" x 8" Cube Core Eggcrate Return Air Grille Black Designed for a 1" thick+ Product Details Size 8" x 18" or 18" x 8" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 9. 75" X 19. 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