18" x 30" or 30" x 18" Cube Core Eggcrate Return Air Grille Return Grille Actual Filter Size – 7

Actual Filter Size – 7 3/4"w x 29 3/4" x 1"

no exceptions

Design – Individually adjusting curved blades

Actual Filter Size – 29 3/4"w x 35 3/4" x 1"

+ Product Details Size - 4"w X 24"h is the size for the duct opening measurement only

18" x 30" or 30" x 18" Cube Core Eggcrate Return Air Grille Return Grille Actual Filter Size – 7+ 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