An air curtain machine uses a motor to drive a cross-flow or centrifugal fan wheel, generating a powerful airflow to create an "invisible door curtain." It divides indoor and outdoor areas into two independent temperature zones, creating a comfortable indoor environment while maintaining indoor air conditioning and purifying indoor air. It saves energy and promotes air circulation, effectively isolating dust, smoke, odors, insects, and microorganisms. It prevents the outflow of cold (or warm) air, saving electricity and minimizing energy leakage. By separating indoor and outdoor areas into distinct temperature zones, it assists in regulating temperature during prolonged operation of air conditioning systems, achieving energy savings, improving environmental conditions, and providing dust and insect prevention.
Thermal Insulation Function
Air curtains are primarily used in places like restaurants and shops where customers frequently enter and exit, requiring constant door opening and closing. They can maintain indoor cold or warm air temperatures with 60-80% efficiency, allowing only minimal temperature changes.

Insect Prevention Function
It can be observed that most annoying and harmful insects cannot pass through the air curtain barrier. This makes it easier to maintain hygiene in places such as fruit counters and fast-food restaurants.

Heating Function
Some air curtain machines also come with electric heating, typically using PTC heating elements. There are also hot water air curtains. Both types can raise the temperature at entrances and exits, with temperature increases ranging from 30 to 60 degrees Celsius. They are commonly used in northern regions.

Dust Prevention Function
If installed in the entrances of machinery factories or food and clothing stores facing bus lanes, air curtains can effectively reduce external dust, maintaining cleanliness at a 60-80% level.