Clean air fans
Clean air fans are used to pump clean or previously filtered air. They are most often used in filters below atmospheric pressure, when the dust collecting system guarantees that the fans will be located on the “clean side”. In systems operating above atmospheric pressure, such fans can successfully be used as pumping devices.
Clean air fans have been designed in a way allowing many years of failure-free operation. The manufacturing processes for rotors utilise steel with increased resistance to bending, with significant thickness to prevent deformation of the rotor blades, which could increase the wear of the engine bearings.
As such fans pump clean air or filtered air, it is possible to design them with a focus on high performance. The efficiency of such fans can reach up to 89%, depending on the model.
With regard to their design, clean air fans are divided into two types:
- horizontal (Type: US-FHN, UL-FHN),
- vertical (Type: US-SFN, UL-SFN).
The horizontal fans are adapted for installation inside a filter, on the “clean side”. Vertical fans, on the other hand, are classic in construction
and suitable for installation both indoors and outdoors.
It should be emphasised that clean air fans meet all the requirements of Commission Regulation (EU) No. 327/2011 of 30 March 2011 implementing Directive 2009/125/EC of the European Parliament and of the Council with regard to ecodesign requirements for fans driven by motors with an electric input power between 125 W and 500 kW.
An example application of a US-FHN or a UL-FHN fan inside a filter.