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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UL Fireproof Door Rating-ZTFIRE Door- Fire Door, Fireproof Door, Fire rated Door, Fire Resistant Door, Steel Door, Metal Door, Exit Door