- 25
- Jul
Fire Proof Doors 3 Yards
- 25
- יולי
- 25
- יולי
Steel fire doors are divided into the following 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 1.0 hours. less than 0.5 hours.