8" X 8" [Duct Opening] 3-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 9.75"H X 9.75"H] 8in diameter Filter Size - 11

Filter Size - 11

+ Product Details Size – 12"w X 36"h is the size for the duct opening measurement only

Actual Filter Size – 29 3/4"w x 15 3/4" x 1"

+ Product Details Size - 25"w X 14"h is the size for the duct opening measurement only

"Opposing" back blades

8" X 8" [Duct Opening] 3-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 9.75"H X 9.75"H] 8in diameter Filter Size - 11+ Product Details Size 8"w X 8"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 9. 75" width X 9. 75" height. High Quality High quality steel with counter sunk screw holes (screws included) and no sharp edges. Equipped with a lever for easy airflow adjustment and dampening. Airflow Control Adjustable airflow lever allows precise control over the direction and volume of air. Installation Location