18" x 30" or 30" x 18" Cube Core Eggcrate Return Air Grille Aluminum - Cube Core Performance – High diffusion induction

Performance – 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 front end outer dimensions are approximately 14 5/8" width X 26 5/8" height

Actual Filter Size – 24 3/4"w x 9 3/4" x 1"

Pre-flared ends with nuts are for simple and easy installation

18" x 30" or 30" x 18" Cube Core Eggcrate Return Air Grille Aluminum - Cube Core Performance – High diffusion induction+ Product Details Size 18" x 30" or 30" x 18" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 75" X 31. 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