DWR is a series of roof fans with vertical air discharge. The fans are characterized by high air efficiency and relatively low noise emission. They are mainly used in production halls, large-area stores and high-bay warehouses.
DWR series fans are equipped with axial impellers. The fan dome combines two functions: a rain cover and an air ejector. The shape of the dome is similar to the shape of a roof ventilator. After disconnecting the fan from the power supply, it starts to work as a typical gravitational ventilator (in the case of a temperature difference, the air flows freely through the fan). This method of ventilation is a very good solution for facilities requiring constant air ventilation at a low level and the possibility of periodically increasing the amount of air supplied.
DWR fans are equipped with single- and three-phase motors adapted to speed regulation. In the case of the need to maintain constant performance, the use of a speed regulator is a good solution. Thanks to the use of a speed controller, it is possible to maintain constant air efficiency at a low level when gravitational ventilation does not work, e.g. too small temperature differences.