6" x 10" or 10" x 6" Cube Core Eggcrate Return Air Grille Outdoor Vent Covers Actual Filter Size – 11

Actual Filter Size – 11 3/4"w x 33 3/4" x 1"

actual front end outer dimensions are approximately 22 5/8" width X 10 5/8" height

85" width X 13

+ Product Details Size - 28"w X 4"h is the size for the duct opening measurement only

If your duct opening is 14 inches in diameter

6" x 10" or 10" x 6" Cube Core Eggcrate Return Air Grille Outdoor Vent Covers Actual Filter Size – 11+ Product Details Size 6" x 10" or 10" x 6" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 7. 75" X 11. 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