20" x 30" or 30" x 20" Cube Core Eggcrate Return Air Grille RV Mobile Home And The Cooler Air From

And The Cooler Air From Outside WIll Flow In From The Bottom

Actual Filter Size – 21 3/4"w x 7 3/4" x 1"

+ Product Details Size – 10"w X 28"h is the size for the duct opening measurement only

+ Product Details Size – 30"w X 8"h is the size for the duct opening measurement only

+ Product Details Size – 6" x 18" or 18" x 6" is the size for the duct opening measurement only

20" x 30" or 30" x 20" Cube Core Eggcrate Return Air Grille RV Mobile Home And The Cooler Air From+ Product Details Size 20" x 30" or 30" x 20" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 21. 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