Liberty composite air handling units is the export trademark of Rosenberg Holland. Designed and manufactured in the Netherlan ... ds by Rosenberg BV. Rosenberg Holland was founded in 1983 and is a fully independent manufacturer of composite roof fans and air handling units. Rosenberg was the first to introduce the composite roof fan on the market. After the successful introduction of a composite roof fan, Rosenberg proceeded to develop a complete composite air handling unit. Thanks to a high market demand, the production of composite air handling units has grown steadily for years. ISO 9001 certified since 1994 and VCA certified since 2007. Today, Rosenberg has two offices in the Netherlands. The headquarters in Den Dolder where the assembly of the Liberty air handling units takes place and the production facility located in Barneveld where the central warehouse and production lines are located. Product innovation in areas such as energy saving, efficiency, heat recovery systems and high quality components are a continuous process. Together with the feedback from our customers and a high knowledge level of our employees, we are able to supply ready-made concepts and custom-built solutions for the future. read more