Basic introduction of induced draft fan to

The induced draft fan is a device that generates negative pressure through the rotation of the impeller, and then extracts air from the system (equipment). It is generally installed at the end of the boiler to extract hot flue gas from the furnace. In daily life, ventilators are usually divided into induced draft fans (for negative pressure) and blowers (for positive pressure) according to the different ways of using positive and negative pressure. Induced draft fans are widely used for ventilation, dust exhaust and cooling in factories, mines, tunnels, cooling towers, vehicles, ships and buildings; ventilation and induced air in boilers and industrial furnaces; cooling and cooling in air conditioning equipment and household appliances Ventilation; drying and selective delivery of grains; air source of wind tunnel and inflation and propulsion of hovercraft. The working principle of the induced draft fan is basically the same as that of the turbo compressor, except that the gas flow rat e is low and the pressure changes little. Generally, there is no need to consider the change of gas specific volume, that is, the gas is treated as an incompressible fluid.

https://www.jnblower.com