Rigel Variable-Frequency Drives from Hoffman & Lamson, Gardner Denver Products, optimize blower efficiency. They offer an annual 20 percent savings in energy usage when compared to inlet throttling, and include SCADA-ready panels, meterless flow control, pre-engineered design packages that reduce electrical installation costs and automated monitoring. By lowering only the unit speed with a variable-frequency drive and not throttling, the blower output decreases while the optimal efficiency remains the same as at full speed. 724/239-1500; www.hoffmanandlamson.com.
