On Tuesday, 23 January 2018 from 13:30-14:30h (Brussels time), the Eurovent Association is going to host a Webinar on its new Recommendation 4/23 (2017) on the “Selection of EN ISO 16890 rated air filter class for general ventilation applications”. All HVAC professionals dealing with ventilation systems are invited to join, independent from their Eurovent membership. After a general introduction, participants are invited to ask questions. The registration procedure is provided within the article.