Laminar airflow vertical horizontal is a type of airflow in which the air travels uniformly and without interruption in one direction. It mostly occurs in two directions: vertically and horizontally. Unidirectional airflow is another name for vertical laminar airflow. This sort of airflow maintains the direction of the airflow by using a number of HEPA filters that are mounted in the ceiling to move the air vertically from the ceiling to the floor. In cleanrooms, operating rooms, and other locations where maintaining a sterile atmosphere is important, this type of airflow is largely used. Air is moved horizontally across a room or workspace by laminar airflow vertical horizontal.