Manufacturer of Integral-Geared Single-Stage Turbo Blowers for the wastewater industry primarily used for aeration applications.
IG Turbos do not require VFDs for flow control, rather diffuser vanes that allow for a 60% turndown from the design point. They also have 2-point control with inlet guide vanes which keeps the blower operating in the sweet spot over the entire range, for the most efficient blower available. Even more efficient than high speed turbos!