About Rosenberg
With production sites and subsidiaries in over 45 countries, we have a global presence – a strong and reliable partner always within reach of our customers.
Our success factors:
vertical integration, expertise
and customer focus
Our headquarters are located in Künzelsau (Baden-Württemberg). This is where our general administration, engineering and production of EC and AC motors and fans are based. Since 2001, the engineering and production of air handling units has been located at our Plant 3 in Glaubitz (Saxony).
The Rosenberg Group
Rosenberg Ventilatoren GmbH was founded in 1981 by Karl Rosenberg.
For more than 40 years, we have been developing and producing controllable external rotor motors, fans and air handling units. As a globally active company, we are represented wherever our customers need us.
With production sites and subsidiaries in over 45 countries, we have a worldwide presence – a strong and reliable partner always within reach of our customers.
Karl Rosenberg Foundation
The Rosenberg Group was transferred to the Karl Rosenberg Foundation in 2023 to secure its future.
The Karl Rosenberg Foundation promotes the identity and culture of the Rosenberg Group as a family business. It supports charitable organisations, in particular the promotion of science, research, art, culture and social projects in the regional environment of the group.
Four good reasons to choose Rosenberg
The entire range of motors, fans and box air conditioners is mainly manufactured in the Rosenberg Group’s own production facilities. From consultation and design to the delivery of ready-to-connect ventilation units, you receive all services from a single source.
Our vertical integration – from motors to controls – makes us less dependent on suppliers and allows us to respond flexibly to your requirements.
- In-house AC and EC motor production
- In-house impeller production
- Fans from our own production
- Air handling units from our own production
- Controls from our own production
In short: we are strong and flexible when it comes to solving problems.
We engage in direct dialogue with our customers right from the development and project planning phase, enabling us to implement special requirements quickly and individually.
Customer satisfaction is always at the focus of our activities.
The continuous exchange of information between customers and employees is our top priority.
This enables us to continuously and consistently optimise our products and quality and respond flexibly to all customer requests.
We do not compromise on the quality and reliability of our products.
Our DIN EN ISO 9001 certification, AMCA certification of our air performance test benches, membership of the RLT-Herstellerverband Raumlufttechnische Geräte (Association of Ventilation and Air Conditioning Manufacturers) and Eurovent certification of our ventilation units confirm our expertise and know-how in the development and production of ventilation systems.
Our company history
Here you will find interesting insights into milestones in the history of the Rosenberg Group.
1981
Foundation of
Rosenberg Ventilatoren GmbH
by Karl Rosenberg
On 10 April 1981, Karl Rosenberg laid the foundation stone for today’s Rosenberg Group by founding Rosenberg Ventilatoren GmbH in Künzelsau. What began as a small assembly company was soon to develop into a global player in the fan industry.
1983
First subsidiaries in
France and the Netherlands
Just two years after its founding, Rosenberg took its first steps onto the international stage and established sales offices in Lyon and Utrecht.
1987
Start of production for
air handling units in Künzelsau
Until now, Rosenberg has been solely a manufacturer of fans for building services engineering. With the expansion of our portfolio of air handling units, we have rounded off our range and now offer comprehensive solutions for air handling and ventilation technology in buildings.
1990
Start of production for
AC external rotor motors
With the start of its own motor production for AC external rotor motors in Künzelsau, Rosenberg strengthened its independence from suppliers and was also able to become active as an original equipment manufacturer in OEM applications thanks to the new opportunities this presented.
1994
Acquisition of French fan manufacturer ECOFIT
The integration of ECOFIT (now Rosenberg Vendôme) enabled Rosenberg to expand its portfolio of motors and fans in smaller sizes and strengthen its position as an OEM manufacturer.
2001
New production plant for ventilation units in Glaubitz
Start of the new production plant for air handling units in the new federal states. The production of air handling units was relocated from Künzelsau to Glaubitz (Saxony) and expanded.
2002
Acquisition of ETRI and launch of Rosenberg USA
Purchase of French fan manufacturer ETRI via subsidiary ECOFIT. American company ETRI Inc. thus becomes a separate branch in Charlotte: Rosenberg USA Inc.
2003
Start of Rosenberg China in Shanghai
With the founding of Rosenberg China and the start of production and sales of AC motors and fans, Rosenberg entered the Chinese market.
2005
Start of development and production of our own EC motors in Künzelsau
Since 2005, we have been focusing on the in-house development and production of energy-efficient EC motors. They offer high efficiency with low power consumption, integrated monitoring functions and, thanks to the integrated control electronics, extended options such as pressure control.
2006
Takeover and relaunch of ROX Klimatechnik GmbH
Rox has been part of the Rosenberg Group since 2006 and operates under the name Rox Klimatechnik GmbH. Since the takeover, the company has developed significantly and is now an independent and reliable partner for the development and manufacture of high-quality room and process air technology systems. The focus is on central room air technology, industrial process air technology and the purification of contaminated exhaust air.
2008
Certification of air performance test benches by TÜV-SÜD
With the certification of our test benches by TÜV-Süd, the reliability and accuracy of our air performance measurements has been officially confirmed by an independent body.
2010
Relocation of the foundry to Medzev
By relocating its own foundry in Slovakia to Medzev, Rosenberg is strengthening the expansion of its own engine castings and further reducing its dependence on external suppliers.
2022
Rosenberg Next Level:
Transfer to a foundation
Securing the future is a key priority at Rosenberg. With the transfer of the Rosenberg Group to a family foundation, the future and independence of the group of companies is now assured.
