The types of fire doors are mainly divided into wood fire doors and steel fire doors. They are divided into three grades: Grade A, Grade B and Grade C. The three grades are mainly the length of fire endurance time. Class A fireproof door, with fire endurance of 1.2; Class B fireproof door, with fire endurance of 0.9; Class C fireproof door, with fire endurance of 0.6.

Iminyango yomlilo ye-ZHTdoors, iminyaka engu-31 yesipiliyoni sokukhiqiza eminyango yomlilo kanye neWindows. Iminyango yomlilo eyinhloko ye-UL, iminyango yomlilo ye-EN, iminyango yomlilo ye-BS EN, njll., Sine-certification.ZHTdoors isekela i-OEM kanye ne-design yamahhala.Izinzuzo zethu: ikhwalithi enhle, intengo yefekthri, isevisi enhle.Siyakwamukela ukuthi uxhumane nathi.