Round Air Vent Cover Outlet Adjustable Exhaust Vent Ducting Ventilation Ceiling Air Vent Cover 4inch Adjustable air volume: This ceiling air supply vent grille cover features adjustable air volume, allowing you to easily control the airflow in your space. Easy to install and secure: With its easy installation process, this vent grille cover can be quickly mounted and is designed to stay securely in place. Efficient indoor exhaust and noise reduction: This vent grille cover is perfect for indoor exhaust, effectively reducing noise and improving air circulation. Decorative design: Not only does this vent grille cover serve a functional purpose, but it also adds a touch of decoration to your space. Colour:White Material:Metal Size:4inch Package Contents: 1 * Round Air Vent Cover Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.