Listen to this presentation on ASHRAE Standard 241-2023, discussing ventilation for healthy buildings. We will explore the historical context of why we ventilate and its relevance to ASHRAE standards 62.1 and 241. During the presentation, we will focus on the crucial need for measuring airflow throughout HVAC systems, delving into the intricacies of today's complex systems. We will challenge the misconception of a false dichotomy between lowering ventilation and achieving energy goals, emphasizing the need for a nuanced understanding of this critical choice. We will conclude with a detailed exploration of airflow measurement for ASHRAE Standard 241, validating designs for optimal performance.