Is the centrifugal fan supplying air or discharging air

Centrifugal fans can be used for both air supply and exhaust, depending on the usage scenario and requirements.
If a centrifugal fan is used as a supply air device in an air conditioning system, its function is to provide fresh air indoors and expel polluted, humid, or uncomfortable air outdoors. If a centrifugal fan is used as an exhaust device, its function is to discharge exhaust gases, smoke, and dust from factories, workshops, or warehouses, ensuring the cleanliness and dryness of indoor air.
Centrifugal fan is a common type of fan, whose main function is to blow gas out of one area or into another area through the centrifugal force generated by rotating the impeller. Therefore, centrifugal fans can be used for both air supply and exhaust, depending on the installation and usage of the fan.
Centrifugal fans are commonly used in industries, construction, aerospace, and other fields for processes such as ventilation, air conditioning, heating, cooling, and exhaust. In ventilation and air conditioning systems, centrifugal fans are usually installed at the outlet of air conditioners or ventilation equipment to transport processed or untreated gas from one location to another. In industrial production, centrifugal fans are often used to emit exhaust gas or provide power.
Therefore, the function of a centrifugal fan is not limited to blowing or supplying air, but is selected and used according to actual needs. Whether it is air supply or exhaust, centrifugal fans can achieve different air volume and pressure by adjusting control devices such as impeller, motor speed, and inlet and outlet valves to meet the needs of different occasions.