14" x 18" or 18" x 14" Cube Core Eggcrate Return Air Grille Powder Coated + Product Details Size –

+ Product Details Size – 25"w X 10"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 16" x 28" OR 28" X 16" duct opening (measured at the opening)

actual front end outer dimensions are approximately 20 5/8" width X 24 5/8" height

Actual Filter Size – 27 3/4"w x 9 3/4" x 1"

14" x 18" or 18" x 14" Cube Core Eggcrate Return Air Grille Powder Coated + Product Details Size –+ 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