Fire shutter is a kind of movable fire partition. Generally, it is made of metal plate such as steel plate, which can be wound into a chain-like plane through buckles or hinges. Generally, it is rolled up and placed in the rotating shaft box at the top of doors and windows, and put down when it catches fire to prevent the fire from spreading from the door and window openings. The fundamental difference in performance requirements between fire shutter used as fire partition or partition of building and general shutter is that it must have necessary combustion performance, fire resistance limit and smoke prevention performance. Fire shutter is divided into light shutter and heavy shutter according to the thickness of shutter plate. The thickness of the steel plate of the light rolling shutter is 0.5 ~ 0.6 mm; The steel plate thickness of heavy-duty rolling shutter door is 1.5 ~ 1.6 mm, and heavy-duty rolling shutter is generally suitable for fire shutter on firewall or fire partition wall. According to the curtain structure, it can be divided into ordinary steel fire shutter and composite steel fire shutter. The former is made of a single steel plate; The latter is made of double-layer steel plate with heat insulation material in the middle. When replacing the firewall, if the fire resistance reaches more than 3.0h, the water curtain protection system can be omitted. Fire shutter is composed of shutter, roller, bracket, guide rail and control machinery. The whole assembly includes a running balancer enclosed in the drum, an automatic closing mechanism, a metal cover and a curtain plate. Fireworks and hot air flow are blocked by the curtain. There are two ways of rolling shutter: electric and manual. Manual type often adopts zipper control. Electric roller blind is a motor installed on a rotating shaft and controlled by buttons. One button can control one or several shutter doors and all the rollers. Fire shutter is a kind of movable fire partition. Generally, it is made of metal plate such as steel plate, which can be wound into a chain-like plane through buckles or hinges. Generally, it is rolled up and placed in the rotating shaft box at the top of doors and windows, and put down when it catches fire to prevent the fire from spreading from the door and window openings. The fundamental difference in performance requirements between fire shutter used as fire partition or partition of building and general shutter is that it must have necessary combustion performance, fire resistance limit and smoke prevention performance.