Replacement of a large belt-driven fan with an ECFanGrid in a hospital. The more even distribution of the airflow through the rectangular shaped duct - 5.9m wide and 2.0m high - leads to a higher efficiency of the downstream components such as filters and heat exchangers. Another important point was hygiene. Thanks to the installation of the ECFanGrid, there is no more abrasion of the belt drive. In addition, the mechanical construction - floor freely accessible - significantly improved the cleanability.