Used for fire smoke exhaust and ventilation in buildings with fire safety requirements, such as subways, tunnels, sports halls, high-rise buildings, underground shopping malls, workshops, ovens, etc. Generally, dual speed motors are used, which operate at low speeds for ventilation and air exchange. In the event of a fire, they will automatically switch to high-speed operation through the electronic control system, quickly exhaust smoke within half an hour, and safely evacuate personnel from the fire scene, protecting the safety of the country and people's lives and property. Transporting air and other non self igniting, non corrosive gases to steel, no viscous substances allowed in the gas, and no dust or hard particles greater than150mg/m3When performing ventilation, the intake temperature should not exceed80℃When used for firefighting purposes, the temperature of the smoke is280℃Can run continuously at any time30More than minutes.