26" x 26" Cube Core Eggcrate Return Air Grille Outdoor Vent Covers + Product Details Size -

+ Product Details Size - 26"w X 34"h is the size for the duct opening measurement only

Actual Filter Size – 13 3/4"w x 13 3/4" x 1"

+ Product Details Size – 24"w X 36"h is the size for the duct opening measurement only

+ Product Details Size – 8"w X 10"h is the size for the duct opening measurement only

Insulation – A thick blanket of fiberglass insulation provides you with an R-Value of 4

26" x 26" Cube Core Eggcrate Return Air Grille Outdoor Vent Covers + Product Details Size -+ 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