This episode we hosted industrial hygienist Allen Barkkume, MS, who informed us about the importance of good building ventilation to help mitigate COVID-19 transmission. Allen explained the hierarchy of controls and the top priority for proper building ventilation is to bring in fresh outdoor air followed by air exhaust, dilution and finally filtration in order of importance. You can find the slides from the presentation here. For more information on building ventilation, please use the links from the last slide in the presentation. More than 40 people attended this webinar.