Unitherm-Cemcon is a private owned company which its main office located in Vienna Austria. Since the enterprise was established in 1946 Unitherm Cemcon has been working in the cement industry. In the past Unitherm Cemcon......Unitherm-Cemcon is a private owned company which its main office located in Vienna Austria. Since the enterprise was established in 1946 Unitherm Cemcon has been working in the cement industry. In the past Unitherm Cemcon produced a large number of traditional rotary kiln burners, installed all over the world. At beginning of the1990’s a long lasting period of engagement in improvement of traditional rotary kiln burner designs ended in an invention of a revolutionary primary air system named M.A.S - Mono-Airduct-System. In September 1993 Unitherm Cemcon installed the first new generation M.A.S. burner which has been operated with coal, natural gas and heavy fuel oil. At first time a rotary kiln burner was equipped with one single primary air channel with an integrated flexible swirl setting mechanism for a sophisticated new kind of flame shaping. In December 1993 our Patent (EP 0642645) was introduced to the public in ”ZKG” and ”Cement review”. All tests had remarkably good results and the first M.A.S. burner installation revealed as big success. At beginning of 1994 our traditional kiln burner execution has been replaced by the new M.A.S. burner system. Development in the last years aimed in combustion of secondary fuels in solid or liquid condition as secondary fuels. We are fully integrated in this process and have delivered more then the half of our burners with integrated facilities for burning secondary fuels.