In the event of a fire, temperature rise doors minimize the heat transfer to the non-fire side of the door. This allows people to safely pass below the floor of fire origin in a burning building.
Temperature rise doors are commonly found in the stairwells of high-rise buildings such as offices, hotels, school dormitories and apartment buildings.
Temperature rise ratings are 250°F, 450°F, and 650°F, which indicates the non-fire side of the door will not exceed that temperature for 30 minutes. The 250°F temperature rise designation is the most stringent rating of the three because it allows for the least transfer of heat.
more information can be contact us or contact us on alibaba. add：https://dljfz.en.alibaba.com/?spm=a2700.galleryofferlist.0.0.4d611f5deOdayq