1. Toxic and harmful gas environment
2. Smoke, Dust Environment
3. Suspended harmful substance pollutants in the air
4. Air oxygen content is low, people can not breathe normally.
5. Firefighters or rescue workers can safely and effectively extinguish fire, rescue and rescue work in various environments such as smoke, poison gas, steam or anoxia.
6. For fire fighting, chemical industry, ships, petroleum, smelting, warehouses, laboratories, mines
