Positive pressure air supply outlet is used for pressurized air supply in the event of a fire. Through the positive pressure air supply outlet, it continuously supplies air to the front room, maintaining positive pressure and ensuring that smoke does not spread in this area, providing a space for people to escape. When the temperature exceeds 280 ° C, there is no possibility for people to escape. The internal fuse will melt, and the air vent will automatically close to prevent the spread of fire. Usually used for installation on the walls of stairwells and smoke shafts, it can also be installed on the side of smoke prevention system pipelines or at the end of air ducts.