One Take #12 - Pandemic Air Math: When Average Just Won't Cut It

Send us a textWe explore the scientific approach behind ASHRAE Standard 241, developed to address airborne infection control in buildings during profound uncertainty. The standard represents a paradigm shift in how engineers design ventilation systems to manage risks from infectious aerosols.• Confronting the challenge that viral emissions from infected individuals vary across seven orders of magnitude• Abandoning deterministic models in favor of Monte Carlo simulations that embrace uncertainty• Setting a specific risk target: keeping infection probability below 0.1% in 96% of scenarios• Creating the concept of eACH (equivalent clean airflow rate) as a universal currency for clean air• Revealing that older standards like ASHRAE 62.1 were significantly inadequate for infection control• Establishing different ventilation requirements based on space type and occupancy patterns• Acknowledging that even well-designed systems cannot eliminate risk completelyRisk modeling for ASHRAE Standard 241-2023 — Control of infectiousaerosolsSupport the showCheck out the Air Quality Matters website for more information, updates and more. And the YouTube Channel The Air Quality Matters Podcast is brought to you in partnership with. Eurovent Farmwood Aereco Aico Ultra Protect Zehnder Group The One Take Podcast is brought to you in partnership with. SafeTraces & InBiot All great companies that share the podcast's passion for better air quality in the built environment. Supporting them helps support the show.