20" x 30" or 30" x 20" Cube Core Eggcrate Return Air Grille Color_Black With HVAC Premium you get

With HVAC Premium you get an extra measure of quality that will be visible to your family members and house guests

Noise free components - no vibrating louvers etc

+ Product Details Perfect Fit & Easy Sizing - Designed for a 24" x 24" duct opening (measured at the opening)

Actual Filter Size – 7 3/4"w x 33 3/4" x 1"

Actual Filter Size – 9 3/4"w x 31 3/4" x 1"

20" x 30" or 30" x 20" Cube Core Eggcrate Return Air Grille Color_Black With HVAC Premium you get+ 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