- 07
- Jan
steel security door 36 x 80,steel security door 36 x 96,32×80 steel security door
Steel fire door according to the fire resistance, fire performance is divided into A, B, C grade. The fire resistance time of class A steel fire door shall not be less than 1.5 hours, the fire resistance time of class B steel fire door shall not be less than 1.0 hours, and the fire resistance time of class C steel fire door shall not be less than 0.5 hours.
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