36" x 36" Cube Core Eggcrate Return Air Grille 8" Diameter Actual Filter Size – 25

Actual Filter Size – 25 3/4"w x 7 3/4" x 1"

Upgrade your air distribution strategy today – invest in the efficiency and convenience of the 8" Radial Damper

+ Product Details Size - 10"w X 6"h is the size for the duct opening measurement only

R value rating of insulation - r3

36" x 36" Cube Core Eggcrate Return Air Grille 8" Diameter Actual Filter Size – 25+ Product Details Size 36" x 36" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 37. 75" X 37. 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