- 29
- Jul
Exterior Door Fire Rated
- 30
- กรกฎาคม
- 29
- กรกฎาคม
There are generally three types of exterior door fire ratings, which are Class A, Class B, and Class C. The fire resistance time of Class A fire doors is not less than 1.5h, the fire resistance time of Class B fire doors is not less than 1h, and the fire resistance time of Class C fire doors is not less than 0.5h.