26" x 26" Cube Core Eggcrate Return Air Grille Compatible With Duct 10in Actual Filter Size – 15

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

actual front end outer dimensions are approximately 38 5/8" width X 34 5/8" height

75"H – fits a 18" X 4" duct opening

Actual Filter Size – 11 3/4"w x 25 3/4" x 1"

26" x 26" Cube Core Eggcrate Return Air Grille Compatible With Duct 10in Actual Filter Size – 15+ 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