8" X 4" [Duct Opening] 3-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 9.75"W X 5.75"H] Aluminum - Cube Core Adjustable airflow control – Adjustable

Adjustable airflow control – Adjustable airflow control: The system allows users to customize the amount of air supply

These grilles and registers give you an extra measure of quality that you can point out to your family members and house guests

With a 5" diameter for the duct opening measurement

Filter Size - 20

8" X 4" [Duct Opening] 3-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 9.75"W X 5.75"H] Aluminum - Cube Core Adjustable airflow control – Adjustable+ Product Details Size 8"w X 4"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 9. 75" width X 5. 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