Varying the Frequency is the most efficient Way

Frequency converter

The Hi-Lo system utilises a common frequency converter. It can be 0.75, 1.5 or 2.2 kW. One 1.5 kW converter can serve up to five big air outlets or 125,000 m3/h.

A single phase supplies the frequency converter, and you save € 1000 or more to special ground fault circuit interrupters. Also ground current is much lower because the fans have no such current, which in turn bring saves to the electrical installation.

All in all the Hi-Lo system is the most accomplished the plainest and the most obvious design for air outlets.

 

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