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.

ZHTdoors 방화문, 방화문 및 Windows 분야에서 31년의 생산 경험. 주요 UL 방화문, EN 방화문, BS EN 방화문 등. 우리는 인증을 받았습니다. ZHTdoors는 OEM 및 무료 디자인을 지원합니다. 우리의 장점: 좋은 품질, 공장 가격, 좋은 서비스. 상담을 환영합니다.