Air curtain machine is a kind of equipment widely used in large shopping malls and industrial places, which can ensure indoor temperature and prevent some mosquitoes from entering the room. The air curtain machine is driven by a high-speed motor to generate a strong airflow by a cross-flow or centrifugal wind wheel, forming an invisible door curtain. So it is also called air curtain machine, air curtain, air curtain machine, air brake and air door.