12" x 14" or 14" x 12" Cube Core Eggcrate Return Air Grille 14" Diameter + Product Details Outer dimensions:

+ Product Details Outer dimensions: 19

Ideal for Walls & Ceilings: Designed for seamless installation in standard 10" X 8" duct openings

75"H – fits a 16" X 12" duct opening

+ Product Details Size – 18" x 28" or 28" x 18" is the size for the duct opening measurement only

Actual Filter Size – 11 3/4"w x 23 3/4" x 1"

12" x 14" or 14" x 12" Cube Core Eggcrate Return Air Grille 14" Diameter + Product Details Outer dimensions:+ Product Details Size 12" x 14" or 14" x 12" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 75" X 15. 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