In the pure-air industrial extraction system, the impeller fan is located behind the filter. Extracted air with its dust and chippings is taken through the filter and cleaned before it passes the fan. As the fan only comes into contact with clean air, it can be designed as a high-performance impeller. The fan casing can be provided with very small air slots which, in conjunction with the closed impeller, help the pure-air system to achieve a far higher efficiency than a raw-air system.
Longer filter service life
The tried-and–tested AL-KO OPTI JET high-performance compressed air system used in the Power Unit range guarantees thorough filter cleaning, and consequently increased filter service life. Raw air impacts onto the filter from outside the unit, and there is ‘real’ surface filtration through special treatment of the filter surface.