UL Fire Door is a fire resistant door certified to UL standards. It is rigorously tested and evaluated to ensure that it can provide effective isolation and protection in the event of a fire.The degree of fire resistance of UL fire doors is evaluated according to two testing standards, UL 10B and UL 10C.
The UL 10B standard is for fire doors and windows. During the test, the door or window is exposed to a standardized flame for a certain period of time and continues to be heated continuously after the flame recedes to assess the fire resistance of the fire door.UL 10C is a more stringent test standard, with a higher requirement for the extended time of the UL 10B standard.
According to UL's classification, UL fire doors are mainly categorized into different grades such as 20 minutes, 45 minutes, 60 minutes, 90 minutes and 3 hours. The 20-minute class is the lowest class of door, which is able to resist flames and smoke for more than 20 minutes after a fire occurs. A 3-hour rated fire door is the highest rating and can resist flames and smoke for more than 3 hours after a fire.
The fire resistance of UL fire doors is largely dependent on the construction and materials used in the door. Generally speaking, the materials used in fire doors include metal, wood, and glass, while the door structure consists of the door leaf, door frame, and sealing device. These materials and structures are able to remain stable and strong when subjected to the impact of hot flames and smoke, forming an effective barrier.
In addition to materials and construction, UL fire doors need to be equipped with qualified accessories such as door locks and closers to ensure that the door can be quickly closed and locked in the event of a fire, preventing the fire from spreading to other rooms or floors. These accessories also need to meet the requirements of the UL standard to ensure that they work properly in the event of a fire.
It is important to note that the fire resistance time of a UL fire door is the amount of time it can continue to resist flames and smoke, and does not completely eliminate the risk of fire. In the event of a fire, timely escape measures are the most important, UL fire doors only play a role in blocking the fire and smoke, to buy valuable time for escape.
Overall, UL fire door is a kind of door with fire resistance performance, which can play an effective role in isolation and protection in case of fire. Depending on the fire resistance level, the fire resistance time of UL fire doors can reach 20 minutes to 3 hours. However, it should be noted that the main function of the fire door is to block the fire and smoke, and can not completely eliminate the risk of fire, so in the event of a fire, you should take timely escape measures.
