Marine Ventilation operation. The agreement goes into effect on June 30, 2005. Segulah. units Callenberg Engineering, Andersson & Callenberg, and El-Marine. there are subsidiaries in Denmark, Norway, the USA, Singapore and China. automation and HVAC systems for the offshore and marine industries. approx. SEK 800 million. been founded as a wholly-owned subsidiary of the Callenberg Group. Gothenburg, Sweden. December of 2003. oil and gas industry,” says Callenberg Group CEO Lars Marcusson. Callenberg Fläkt Marine has a strong position in the marine industry. offices and agent networks with Callenberg’s existing marketing organization. technically complex assignments within its core fields of operation.