- 22
- 3月
UL 6 panel fire door 44mm,fire door and fire exit,steel fire exit
Steel fire doors are divided into the following three types: the fire resistance time of Class A steel fire doors shall not be less than 1.5 hours; the fire resistance time of Class B steel fire doors shall not be less than 1.0 hours; the fire resistance time of Class C steel fire doors shall not be less than 1.0 hours. less than 0.5 hours.
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