18" x 24" or 24" x 18" Cube Core Eggcrate Return Air Grille Fixed Blades Filter Size - 7

Filter Size - 7

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

Actual Filter Size – 29 3/4"w x 27 3/4" x 1"

Actual Filter Size – 25 3/4"w x 9 3/4" x 1"

18" x 24" or 24" x 18" Cube Core Eggcrate Return Air Grille Fixed Blades Filter Size - 7+ 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