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1. Since it is impossible for people to close doors immediately when a fire breaks out, fire doors must close automatically, and automatic door closers must be installed. It should be noted that an automatic door closer should not be installed on the side facing the fire, to avoid damage from high temperatures in case of a fire. It is necessary to ensure that the automatic door closer is sensitive and functional; if it gets damaged, it should be replaced promptly. 2. Fire doors that are kept open at regular times must be equipped with fixing devices to facilitate passage. Generally, an electromagnetic release switch or a fusible alloy is used to secure the door to the two side walls; in the event of a fire, the power is cut off, the magnetism is lost, or the alloy melts, causing the door to close automatically due to the action of springs. Fire doors cannot be secured using hooks or keycards, as people in a panic during a fire will not close them, allowing smoke and flames to enter. 3. To address the issues of both fire prevention and theft prevention, electromagnetic door locks can be used on fire doors. The personnel in this building can enter using keys; in case of a fire, the circuit is activated either through the operation of smoke detectors or via remote control from the fire control room, allowing the door to be pushed open. A simple mechanical push-bar door lock can also be installed; it can be opened by pushing from the inside at any time, and it closes automatically once someone exits. To enter from the outside, a key is required. 4. Some double-door fire doors have interlocking edges to ensure a tight seal; if the doors are closed in the wrong order, they cannot be sealed properly. Therefore, a sequencer is required to control the sequence in which the doors close. 5. If the handle of a fire door must be turned by hand to open it, it may become too hot to operate in the event of a fire. For this purpose, a push rod type door lock is suitable; the fire door can be opened simply by pushing it with the hand or by applying pressure with the body. 6. Prevent carpets or indoor furnishings from getting stuck in the fire door to ensure it can be used properly in case of a fire.