14" x 18" or 18" x 14" Cube Core Eggcrate Return Air Grille Insulated Line Set 75" width X 35

75" width X 35

Actual Filter Size – 15 3/4"w x 7 3/4" x 1"

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

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14" x 18" or 18" x 14" Cube Core Eggcrate Return Air Grille Insulated Line Set 75" width X 35+ Product Details Size 14" x 18" or 18" x 14" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 15. 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