1, the air supply system is the equipment that filters, disinfects, sterilizes, oxygenates and preheats the indoor air (in winter) while supplying air.

2. The smoke exhaust system is a device that can be started quickly when a fireworks disaster occurs in a building, and the smoke can be discharged out of the building in time to create favorable conditions for saving lives and extinguishing fires.

3. Ventilation system is a building environment control technology to ensure the indoor and outdoor air environment quality through ventilation dilution or ventilation exclusion.

Second, the scope of application

1, the air supply system is mainly used in situations where return air is not allowed and pollutants are prevented from spreading each other;

2. The smoke exhaust system is mainly used in high-rise buildings, underground projects, traffic tunnels and public places of entertainment;

3. Ventilation system is mainly used for urban rail transit (including subway), underground complex, tunnel, civil air defense engineering, semiconductor industry, precision machinery and other purposes.