Fans are widely used in the ventilation, dust removal and cooling of factories, mines, tunnels, cooling towers, vehicles, ships and buildings; the ventilation and ventilation of boilers and industrial furnaces; the cooling and ventilation of air conditioning equipment and household appliances; the drying and selection of grain; the inflation and propulsion of wind tunnel air sources and hovercraft.

Flow rate: The volume of gas flowing through a fan per unit time. The commonly used units are cubic meters per hour (m ³/h) and cubic feet per minute (CFM).

pressure: The difference in gas pressure at the inlet and outlet of the fan. The commonly used units are Pa (Pa), millimeter water column (mmH2O), inch water column (inH2O O), etc.

RPM: The speed at which the fan rotates. The commonly used unit is "revolutions per minute" (rpm).

Axis power: The power required to drive the fan to rotate, commonly expressed in "kilowatts" (kW).

Efficiency: There are various losses in the process of the prime mover transferring energy to the fan. Only part of the transmitted energy is useful. Efficiency is often used to reflect the size of the loss.

5. Application field

Fans are widely used in the ventilation, dust removal and cooling of factories, mines, tunnels, cooling towers, vehicles, ships and buildings; the ventilation and ventilation of boilers and industrial furnaces; the cooling and ventilation of air conditioning equipment and household appliances; the drying and selection of grain; the inflation and propulsion of wind tunnel air sources and hovercraft and other fields.