What is this? The round air vents usually are mounted on the wall hole or ceiling hole to keep the air flowing. Widely used in the vent of home kitchen, bathroom, living room, garage, or office. Are there any advantages of the product? The mesh screen can prevent stones or other things from getting to your room and keep the airflow at the same time. White panels and black sleeves are removable, convenient to clean and wash. Adjustable, rotate to change the airflow according to your need. How to use it? Easy to use, make sure the black sleeve is inserted into the wall or ceiling hole and rotate it. Then the air vent will fix on the wall.