- 27
- Sep
કલાક ફાયર પ્રૂફ સ્ટીલ સિક્યોરિટી ડોર
The fire resistance rating of steel fire doors is divided into 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 0.5 hours.