28" x 30" or 30" x 28" Cube Core Eggcrate Return Air Grille 18" Round Duct Pipe Control Your Airflow on drop

Control Your Airflow on drop ceiling grilles

+ Product Details Perfect Fit & Easy Sizing - Designed for a 6" x 8" or 8" x 6" duct opening (measured at the opening)

Actual Filter Size – 21 3/4"w x 5 3/4" x 1"

+ Product Details Size - 24"w X 18"h X 2"d (for duct opening measurement only)

+ Product Spec Sheet

28" x 30" or 30" x 28" Cube Core Eggcrate Return Air Grille 18" Round Duct Pipe Control Your Airflow on drop+ Product Details Size 28" x 30 or 30" x 28" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 29. 75" X 37. 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