20" x 30" or 30" x 20" Cube Core Eggcrate Return Air Grille Color_Black + Product Details Perfect Fit

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

& EN 13180 standards

Noise free components - no vibrating louvers etc

Actual Front End Outer Dimensions Are 12" Width X 4" Height - SEE IN DESCRIPTION HOW TO MEASURE A GRILLE

actual front end outer dimensions are approximately 8

20" x 30" or 30" x 20" Cube Core Eggcrate Return Air Grille Color_Black + Product Details Perfect Fit+ 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