- 07
- Nov
UL Fireproof Door Rating
Fire doors are classified into the following three types: Class A, Class B and Class C. The fire resistance time of Class A fire door shall not be less than 1.5 hours; The fire resistance time of Class B fire door shall not be less than 1.0 hour; The fire resistance time of Class C fire door shall not be less than 0.5 h.
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