Finding F-1426

“Ventilation reduced exposure by approximately 5% per unit increase in air change per hour (ACH), irrespective of whether increases in ACH were by the HVAC system or portable HEPA air cleaners.”

Coyle et al. Efficacy of Ventilation, HEPA Air Cleaners, Universal Masking, and Physical Distancing for Reducing Exposure to Simulated Exhaled Aerosols in a Meeting Room (2021). Viruses. Page 1. CKB 8406

Structure

Factor: Ultrafine particles (UFP)
Intervention: Air filtration and air purifiers
Setting: test chamber
Study design: chamber experiments with breathing simulators: personal exposure to respiratory aerosols measured under combinations of ventilation rate, portable high efficiency air cleaners, universal masking, source placement and distance (class 3)
Effect: difference 5 per 1 %
Caveat: breathing simulators in a chamber, not people in a room

A Finding records what one published document states, verbatim and with its page. It is not a conclusion of Coridum; see the Claims that build on it.