The renovated Stifthaus is the new training center of the electrical company Vieweg in Chemnitz. The house existed before reunification and is now the workplace of more than 120 people. A wood composite construction was chosen for the new training center and the cooling and heating supply is provided by heat pumps and geothermal energy. We supplied a total of 30 acoustically effective cooling and heating ceiling sails with an area of 168 m². The white sails have RAL 9010 color and Q6x16 perforation. The width of the sails is 1480 mm – the lengths vary from 1900, 3100, 3300, 3400 and 4800 mm. The large-sized sails fit wonderfully into the successful architecture of the DIA179 office from Berlin.