Concrete housings for ventilator systems - The research project with Hürner Funken is sucessfully finished and evaluated by the Hessen Argentur in Wiesbaden. The outstanding result is a very thin and light-weight concrete housing with advanatges for environmental influences, chemical influences, lifetime, installation and service. Compared to the original 'plastic' housing, a competitive technology was developed that now will be transfered into a series production.