6" x 28" or 28" x 6" Cube Core Eggcrate Return Air Grille Width_20in Ideal for Walls & Ceilings:

Ideal for Walls & Ceilings: Designed for seamless installation in standard 18" X 6" duct openings

Actual Filter Size – 25 3/4"w x 33 3/4" x 1"

actual front end outer dimensions are approximately 14 5/8" width X 8 5/8" height

Design - special "V" shaped louvers ensure 100% view block while ensuring easy un-restricted air flow

Powder paint coating - White

6" x 28" or 28" x 6" Cube Core Eggcrate Return Air Grille Width_20in Ideal for Walls & Ceilings:+ Product Details Size 6" x 28" or 28" x 6" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 7. 75" X 29. 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