With over 35 years of manufacturing experience in smoke and heat vent systems, natural ventilation systems as well as automatic driving systems for windows, D+H is one of the leading providers of innovative ventilation and smoke extraction concepts in modern buildings. D+H components are convincing in objects of any kind and size as they offer technical perfection, reliability and maximum security. D+H Systems are mainly provided in public buildings such as schools, shopping centers, airports and train stations as well as in office and administration buildings and private houses and apartments.