Quartz: “There is growing consensus that one of the primary ways the novel coronavirus spreads is through the air. That makes it risky to put a lot of people in a poorly ventilated space. As schools, offices, and businesses reopen, facilities managers are looking at one particular metric to gauge whether there’s an elevated risk of coronavirus transmission: air changes per hour (ACH)…”

This articles discuses: What are air changes per hour?; How to calculate air changes per hour; and How to increase air changes per hour in your space.