Fire doors can be divided into normally closed fire doors and normally open fire doors according to the opening state. Normally closed fire doors are usually closed under the action of door closers. Therefore, it can prevent smoke from spreading in case of fire; Normally open fire doors are usually opened under the action of door closers. In case of fire, the automatic release switch is automatic, and the fire door closers are closed under the action of door closers and aligners.

የ ZHTdoors የእሳት በሮች, በእሳት በሮች እና በዊንዶውስ ውስጥ የ 31 ዓመታት የምርት ልምድ. ዋናው የ UL የእሳት በሮች ፣ EN የእሳት በሮች ፣ BS EN የእሳት በሮች ፣ ወዘተ., የምስክር ወረቀት አለን ZHTdoors ድጋፍ የኦሪጂናል ዕቃ አምራች እና ነፃ ንድፍ.የእኛ ጥቅሞች: ጥሩ ጥራት, የፋብሪካ ዋጋ, ጥሩ አገልግሎት.እኛን ለማነጋገር እንኳን ደህና መጡ.