- 20
- Feb
double leaf fire door,rolling steel door fire rated,fire resistant doors
Fire doors are classified into Grade A, Grade B and Grade C according to their fire resistance. The fire resistance time of Class A fire door shall not be less than 1.5 hours, that of Class B fire door shall not be less than 1 hour, and that of Class C fire door shall not be less than 0.6 hours. Different places shall be equipped with fire doors of corresponding levels for use.
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