In practical application, fire doors should pay attention to a lot of precautions, otherwise incorrect use will still cause high-quality steel fire doors to lose their effect and become furnishings. In the use of fire doors, we should distinguish the differences in the use of fire doors with different functions. Class C fire doors are usually composed of wooden fire doors and glass. The main function of this fire door is to check the operation of the equipment and to block heat. This kind of door is always kept closed. If it is a Grade A or Grade B steel fire door, it will be used in the entrance and exit of the fire passage when it is used, so its existence should ensure the passage of personnel. Therefore, in the use of this type of door leaf, the door should be kept closed but can be opened to avoid locking and preventing personnel from being able to clear it. After understanding the correct use of doors and windows, it is necessary to organize exercises frequently to help staff understand the use of steel fire doors.