10" x 36" or 36" x 10" Cube Core Eggcrate Return Air Grille Fixed Blades with Damper it effectively prevents unauthorized access

it effectively prevents unauthorized access

+ Product Details Size - 32"w X 28"h is the size for the duct opening measurement only

Actual Filter Size – 19 3/4"w x 13 3/4" x 1"

+ Product Details Size – 26"w X 22"h is the size for the duct opening measurement only

Actual Front End Outer Dimensions Are 12" Width X 5" Height - SEE IN DESCRIPTION HOW TO MEASURE A GRILLE

10" x 36" or 36" x 10" Cube Core Eggcrate Return Air Grille Fixed Blades with Damper it effectively prevents unauthorized access+ Product Details Size 10" x 36" or 36" x 10" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 11. 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