26" x 26" Cube Core Eggcrate Return Air Grille Compatible With Duct 10in Actual Filter Size – 27

Actual Filter Size – 27 3/4"w x 7 3/4" x 1"

Actual Filter Size – 15 3/4"w x 33 3/4" x 1"

+ Product Details Perfect Fit & Easy Sizing - Designed for a 6" x 24" or 24" x 6" duct opening (measured at the opening)

actual front end outer dimensions are approximately 18 5/8" width X 27 5/8" height

75"H – fits a 18" X 4" duct opening

26" x 26" Cube Core Eggcrate Return Air Grille Compatible With Duct 10in Actual Filter Size – 27+ Product Details Size 26" x 26" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 27. 75" X 27. 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 electric