10" x 18" or 18" x 10" Cube Core Eggcrate Return Air Grille 14" Diameter actual front end outer dimensions

actual front end outer dimensions are approximately 22 5/8" width X 27 5/8" height

The total outer size of this grille is the listed size

Actual Filter Size – 35 3/4"w x 27 3/4" x 1"

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Design – Easy unrestricted air flow for your HVAC system

10" x 18" or 18" x 10" Cube Core Eggcrate Return Air Grille 14" Diameter actual front end outer dimensions+ Product Details Size 10" x 18" or 18" x 10" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 11. 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