These are systems that close in case of fire and separate the two environments.
In manual doors that are kept open using a magnetic holder, the door can also be closed with the signal from the central alarm system. Automatic systems with electric motors can also be used as service doors when necessary, and they can be kept normally closed or open. In addition to the fusible links in the manual system, the door can be closed in case of fire with the signal from the central alarm system or the signal given by the smoke sensors included in the door's automation system. An independent and local control system can also be established by adding many smoke and temperature sensors to the door automation system. In emergency situations, even if a malfunction occurs in the electrical system or the automation system of the door, the door is ensured to close automatically. They can be produced with an integrated pedestrian crossing gate to be used under normal conditions when the door must be kept closed. Wicks that expand with temperature provide smoke tightness.