History

 

 

 

1934

Mr. Diermayer invents and patents a hingeless, bimetallic strip controlled isolating damper for gas-fired instantaneous water heaters; production and sale of the "Diermayer dampers". This flue gas damper is licensed by a number of gas works in Germany. 



 

 

1939

The hingeless Diermayer damper is licensed by the Deutscher Verein von Gas- und Wasserfachmännern (DVGW - Association of German Gas and Water Engineers).

 

 

 

since

1949

Manufacture of Diermayer dampers by the Franz Weber company, Munich. Subsequent incorporation in the Technical Rules for Gas Systems, expansion of the dampers to include gas furnaces and introduction of the product range in Austria and Switzerland (1960).

 


 

 

1962

Continued development of the Diermayer dampers for instantaneous gas water heaters, publication of the DVGW Technical Standard G 654 as a Technical Rule for thermally controlled flue gas dampers - further technical modifications and adaptation to reflect developments in appliances.

 


 

1965

The Franz Weber company relocates from Munich to a new building in Gröbenzell.

 


 

 

1970

Publication of DIN 3388 Part 1 as a standard for thermally controlled flue gas dampers for gas appliances. This was also the basis for corresponding regulations in foreign markets.

 


 

1973

1st energy crisis, increasing the range of applications for energy-saving flue gas dampers. The development of motor-controlled Diermayer dampers followed.

 


 

 

1978

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1980

Further development and upgrading of KW products. Production under licence starts in the USA. Motorised Diermayer dampers used for liquid fuels as well as solid, expansion for use as positively operated draft regulators for the drying of chimneys.


 

 

1981

The company relocates to new premises in Maisach.

 


 

1985

Development and production of the KW draft restrictor.

 


 

1987

Takeover of Servo Instruments Deutschland SID - the flue gas damper range is expanded accordingly.

 


 

1988

Introduction of the first range of flue gas silencers.


 

 

1989

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1996

Development and sale of a wide range of solutions for the boiler industry, also function-assisting and energy saving products for heating and flue gas engineering.

 


 

1997

The company is taken over by the Raab Group.

 


 

1999

Specialisation in the field of flue gas noise, further development of solutions for the market.

 


 

 

2001

Integration of Servo-Instruments (SID) into the KW licence partnership with the Fraunhofer Institute for Building Physics (IBP) in Stuttgart as our scientific partner in the development of specialist silencer solutions. Work starts on the development of integrated solutions for the boiler and flue gas industry.

 


 

2002

Modernisation and adaptation of the flue gas damper range. New foreign markets are opened up.

 

 

2010

Rolf Wagenfeld accepts the group Raab. A native of Bremen knows the Raab Group since 2001 as a board member. From 2007 he was the Deputy Council Chairperson, held the Council Presidency since 2009.

 

 

2015

The Raab Group expanding its product range by purchasing a recovery specialists: The NET Neue Energie-Technik GmbH in Puchheim near Munich, is more than 20 years in the heat exchanger business operates and brings industry knowledge in the design, manufacture and servicing of the heat recovery systems with.