Air Cooler FLQ is utilized within a positive pressure conveying system and connects to the outlet of the roots blower. High-temperature air discharged by the roots blower enters the inlet of the air cooler through the blowline pipe and is then dispersed to multiple groups of cooling channels through the horizontal concentrated pipe. The cooling channel conducts heat to the cooling fins, which are composed of aluminum alloy fins with very high heat conduction efficiency. Multiple sets of cooling channels and fins form a panel type radiator. The airflow generated by the axial fan passes through the panel radiator vertically, takes away the heat dissipated by the radiator and exhausts the hot air to the outside; this reduces the high-temperature air generated by the roots blower to a suitable temperature. Generally, the temperature of the discharged air flow after cooling should be ten degrees higher than the ambient temperature.