Rosenberg Introduces New Generation of Backward Curved Fan Impeller That Boosts Efficiency and Reduces Noise

Rosenberg's new seven-blade backward curved impeller can significantly reduce noise and increase efficiency compared to standard eight-blade impellers. The new impeller is available in nine sizes from 250 to 630 mm for use with Rosenberg's EC motors, AC external rotor motors or standard IEC motors.

Charlotte, N.C. April 30, 2013


Rosenberg's new LRHF-B impeller is a backward-curved seven-blade aluminum fan wheel especially designed for demanding air-movement tasks with low noise and high efficiency requirements. The new "B-Wheel" design can increase efficiency by nearly six percent and reduce noise by three decibels compared the standard eight-blade design, depending on the application.

On the B-Wheel impeller, the blade diameter is smaller than the outside diameter of the cover and support plate, which acts as a rotating outlet diffuser. This new wheel geometry allows for impeller efficiencies up to 78% and also improves air volume over standard impellers operating at the same speed.

Sizes include 250 mm, 280 mm, 315 mm, 355 mm, 400 mm, 450 mm, 500 mm, 560 mm and 630 mm, for application with Rosenberg's EC motors, AC external rotor motors or standard IEC motors. All Rosenberg fan motors are CE, UL and RoHS approved.

Rosenberg B-Wheel impellers feature all aluminum construction and robot-assisted welding. They are suitable for hygienic or outdoor applications without additional finishing or surface treatment.

With the enormous efficiency advantages of this new series of impellers, users can easily meet the values specified in the European Ecodesign Directive 2009/125/EC (ErP Directive).

About Rosenberg

The Rosenberg family of companies is headquartered in Künzelsau, Germany and employs more than 1,400 individuals worldwide. Rosenberg fans and blowers can be found in HVAC systems, as well as industrial and portable air conditioning; in air cooling for variable frequency drives (VFD), wind power generators and power converters, solar inverters, uninterruptable power supplies (UPS), transformers, heat sinks, fan coils, telecom racks and other industrial equipment; in air handling units and fan filter units (FFU); and in railway, marine, military and avionics equipment.

Rosenberg USA is located just outside Charlotte in Indian Trail, N.C. For more information, or to place an order, contact Rosenberg USA by phone at (704) 893-0883; fax (704) 882-0755 or e-mail sales(at)rosenbergusa(dot)com.

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