The FL series air cooler is mainly used for walking machinery (excavators, loaders, forklifts, cranes, combine harvesters, road construction machinery, engineering machinery, etc.) and is suitable for other hydraulic, lubrication systems, and heat exchange cooling systems. It uses air cooling to forcibly cool the working medium to the required temperature.

Air cooler, abbreviated as air cooler, uses air as the cooling source and can be used as both a cooler and a condenser. Air coolers are mainly composed of tube bundles, brackets, and fans. The hot fluid in the air cooler flows inside the tube, while the air blows outside the tube bundle. Due to the large amount of ventilation required for heat exchange and low air pressure, axial flow fans are often used (see fluid conveying machinery).

The type and material of the air cooler tube bundle have a significant impact on the performance of the air cooler. Due to the small heat transfer coefficient on the air side, fins are often added to the bare tube to increase the heat transfer area and reduce thermal resistance. Most air coolers use wrapped fins. At present, air coolers usually use light tubes with an outer diameter of 25mm, low fin tubes with a fin height of 12.5mm, and high fin tubes with a fin height of 16mm. Fins are generally made of materials with high thermal conductivity (the most commonly used being aluminum) and wrapped or embedded onto light tubes. To enhance the heat transfer efficiency of the air cooler, water can be sprayed into the inlet air for humidification. This not only lowers the air temperature but also increases the heat transfer coefficient. The use of air coolers can save a large amount of industrial water, reduce environmental pollution, and lower infrastructure costs. Especially in water scarce areas, using air cooling instead of water cooling is convenient and practical.