20" x 30" or 30" x 20" Cube Core Eggcrate Return Air Grille RV Mobile Home + Product Details Size –

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

Can be hooked up with our Butterfly Dampersfor precise airflow control

+ Product Details Size – 32"w X 16"h is the size for the duct opening measurement only

+ Product Details Size – 36"w X 34"h is the size for the duct opening measurement only

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

20" x 30" or 30" x 20" Cube Core Eggcrate Return Air Grille RV Mobile Home + Product Details Size –+ 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