6" x 28" or 28" x 6" Cube Core Eggcrate Return Air Grille Curved Blade Steel please note that the total

please note that the total outer dimensions of the grille measure 14" in diameter

Actual Filter Size – 7 3/4"w x 23 3/4" x 1"

Measure the size of the air duct/drywall opening

actual front end outer dimensions are approximately 22 5/8" width X 24 5/8" height

6" x 28" or 28" x 6" Cube Core Eggcrate Return Air Grille Curved Blade Steel please note that the total+ Product Details Size 6" x 28" or 28" x 6" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 7. 75" X 29. 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