Feedback on installation, maintenance, and aging of mechanical humidity-controlled exhaust units

How do humidity sensitive products perform over long periods of time ? With 35 years of existence and more than 10 million equipped dwellings, mechanical humidity-based demand-controlled ventilation (HR-DCV) can provide a comprehensive feedback on installation, aging, and maintenance of its components. Their working principle is based on the extensions and retractions of a hygroscopic fabric, which pulls on a shutter to modify the device’s cross-section – hence the airflow – upon humidity changes in their environment. In 2006, before generalizing the usage of HR-DVC in French residential buildings, the Ministry for Housing ordered an evaluation of these systems after prolonged on-site operation. For this purpose, the COSTIC laboratory selected 21 social housings in the Parisian suburb, and collected with Aereco 57 extraction units after 6 years of in-situ functioning. Discover in this webinar all the on-site observations and conclusion. Questions asked by participants: • How do you determine if the IAQ is ensured? 13:29 • What is IAQ? 14:40 • Would you advise against installing auto-adjusting exhaust units? 15:30 • What was the manual shutter position during the tests? 17:47 • To your knowledge, is that the first study about ventilation units aging (in situ + in lab) ? 18:09 • What about the inlet ? Do the sytem works properly after 6 years without maintenance or with poor maintenance ? 19:13 • Can you explain one more time why you were changing the tolerance range from higher to lower? 20:25 • How regularly do you think the units should be cleaned? 21:58 • Do you have some precise prescription for air inlets as well as extract units maintenance? 22:22