According to the requirements of the fire door manufacturer to obtain the fire door test report, the products with corresponding grades and materials can be produced within the approved size range. If the enterprise obtains the qualification of steel a 1521 double door, it can produce steel a fire door with the size of 1m-1.5, and other sizes are the same; Make sure the product material, fire resistance rating and opening type are accurate. Normally closed fire doors are closed at ordinary times and need to be pushed open when people move around. The normally closed fire door has some disadvantages in this open state. Because the place where the fire door is installed is usually the passage where people often walk, there is a certain contradiction. In particular, large shopping malls have a large flow of people. If normally closed fire doors are set in the internal evacuation staircase, the fire doors will soon be damaged and fall off due to frequent opening and closing, which will not play a fire prevention role and form a fire hazard.
For example, the door closer provides the ability of automatic closing for the fire door, and the hinge provides the ability of normal operation. In case of fire, it can ensure the overall tightness, prevent the fire and smoke from spreading rapidly through various cracks, and make the fire door useless. At the end, fireproof sealing strips are pasted around the fire door leaf, which will expand rapidly under high temperature to ensure the overall tightness. In the process of installing fire doors, great attention is paid to the overall sealing. Whether the installation and use of accessories or the filling of peripheral gaps provide important preconditions for the products to give full play to the fire prevention effect.
Normally open fire doors are usually open and automatically closed in case of fire. Because it is kept open at ordinary times, it makes it convenient for personnel to pass through, convenient for ventilation and daylighting, and can be closed by itself in case of fire. It plays the role of smoke separation and fire resistance, so as to solve the inconvenience caused by the closing of the fire door at ordinary times and the human damage caused by the frequent opening and closing of the fire door, and ensure the fire safety at the same time. The fire door set at the place where people often pass in the building should adopt the normally open fire door. The fire door in the public parts of the building (traffic core) including smoke proof staircase, fire elevator front room and shared front room should be the normally open fire door, and the fire door set at the evacuation aisle of the hall should also be the normally open fire door. Therefore, in the evacuation staircases of some large shopping malls, normally open fire doors should be set, which are usually open. In case of fire, various sensors control the door closer to close the door.
In addition to the positions where normally open fire doors are allowed, fire doors at other positions shall adopt normally closed fire doors. In other words, in the design, except for the normally open fire door indicated in the drawing, other fire doors shall be normally closed fire doors. This requires the designer to indicate in the door and window table when selecting the fire door. If the specification requires that the fire door is normally open, the reviewer can review it accordingly.
