Positive pressure supply fans are fans that deliver air into the emergency stairwell. They push outdoor air pressure into the indoor space. When a fire occurs in a building, it generates a large amount of smoke.Toxic gasTo block visibility and supply fresh air to the emergency exit stairs via positive pressure fans, preventing smoke from reaching the stairs inside, thereby creating conditions for people to escape.

Positive pressure fans are typically installed on the roof of buildings, interconnected with positive pressure air valves on each floor. During the early stages of a fire, open the air valves, start the positive pressure fans to maintain a positive pressure state (air supply state) in the stairwell and elevator lobby.

Generally, louvers are set up in the ventilation shafts on each floor for use as air supply windows. The ventilation shaft openings on each floor differ, with single or double-layer settings to ensure air pressure; or set up...Pressure-supply air outletSometimes equipped with manual and remote controls, capable of adjusting air volume.