18" x 24" or 24" x 18" Cube Core Eggcrate Return Air Grille Fixed Blades High diffusion induction rates result

High diffusion induction rates result in rapid temperature and velocity equalization of the mixed air mass well above the zone of occupancy

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Actual Filter Size – 25 3/4"w x 7 3/4" x 1"

Filter Size - 7

18" x 24" or 24" x 18" Cube Core Eggcrate Return Air Grille Fixed Blades High diffusion induction rates result+ Product Details Size 18" x 24" or 24" x 18" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 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