- 26
- Oct
Qingdao Fire Door
There are three types of steel fire doors: Class A steel fire doors shall have a fire resistance time of not less than 1.5 hours, Class B steel fire doors shall have a fire resistance time of not less than 1.0 hours, and Class C steel fire doors shall have a fire resistance time of not less than 0.5 hours.
ZHTdoors hluav taws qhov rooj, 31 xyoo ntawm kev tsim khoom hauv qhov rooj hluav taws thiab qhov rais. Lub ntsiab UL qhov rooj hluav taws, EN qhov rooj hluav taws, BS EN qhov rooj hluav taws, thiab lwm yam.,.Peb muaj ntawv pov thawj.ZHTdoors txhawb OEM thiab tsim dawb.Our zoo: zoo zoo, Hoobkas nqi, kev pabcuam zoo.Zoo siab txais tos los tham nrog peb.