So where do air respirators usually appear? In fact, SCBA is widely used in fire control, chemical industry, ship, petroleum, smelting, electric power, warehouse, laboratory, mine and other key fire departments. The most important or SCBA is for firefighters or emergency rescue personnel in the smoke, gas, steam and hypoxia and other environments for safe and effective fire fighting, rescue and disaster relief and rescue work, is an ideal personal respiratory protection device for firefighters or emergency rescue personnel.