CHARLOTTE, N.C. – Rosenberg’s new trestle-design GKHB 5.5kW backward curved fan module combines an electronically commutated (EC) motor with the high-efficiency, award-winning Rosenberg B-Wheel impeller for even greater efficiency and easy installation. The new B-Wheel Trestle Module features a standard flexible duct connection.

The GKHB Series is available in three impeller sizes; 450 mm, 500 mm and 560 mm offering maximum airflow of up to 10,000 CFM at free air or 3,000 cfm at up to seven inches of static pressure. Flexible duct connections comply with the customary industrial standard nominal sizes.  Applications include data center cooling, HVAC, air handling units, and air quality products.

Rosenberg GKHB backward curved radial fans employ an electronically commutated external rotor motor with integrated power electronics. Like all Rosenberg EC fans, these highly energy efficient units meet all requirements of the European Union’s ErP Directive for fans. Rosenberg EC fans feature extended-life, low-temperature brushless DC motors.

Rosenberg EC motors come with a pre-installed potentiometer and provide variable fan speed control from 5% to 100%. Air volume can be adjusted to any possible operating point. Standard voltage for the GKHB Series is 3~ 380-480VAC, 50/60Hz.  The motors are UL-Recognized.

The unique B-Wheel impeller features a seven-blade design (instead of the standard eight) in which the blade diameter is smaller than the outside diameter of the cover and support plate, allowing it to act as a rotating outlet diffuser. This new wheel geometry and improved paddle design can increase impeller efficiencies by 6%, up to 78%, while reducing noise by up to four dBA, depending on the application and operating conditions. It also increases airflow compared to standard impellers operating at the same speed.

In addition to a full line of standard products, Rosenberg’s flexible production and application engineering capabilities make it possible to manufacture fans for specific applications and unique customer requirements.

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