Finding F-0413

“The use of the dynamic window ratios, from 0.23% to 2.16%, modified according to the measured carbon dioxide concentration, can partially maintain the carbon dioxide below the required limits for ASHRAE 62.1, Hygiene Measures Against COVID‐19 and UNE‐EN 16798 between 48.28% to 74.14% of the time.”

Validation of Dynamic Natural Ventilation Protocols for Optimal Indoor Air Quality and Thermal Adaptive Comfort during the Winter Season in SubtropicalClimate School Buildings (2024). Page 2. CKB 0888

Structure

Factor: Carbon dioxide (CO₂)
Intervention: Natural ventilation
Population: school pupils
Setting: classroom, ES
Study design: validation of a dynamic natural ventilation protocol in a school classroom in Huelva (subtropical climate, winter): CO2-driven window opening ratios first simulated, then monitored on three non-consecutive days in winter 2021 with 21 occupants, share of time below the CO2 limits of ASHRAE 62.1, UNE-EN 16798, the Spanish COVID-19 hygiene protocol (800 ppm) and RITE (500 ppm) (class 4)
Effect: share-below 48.28
Averaging time: share of monitored time over three school days
Caveat: the sentence gives a range across days; the two ends are recorded as two rows

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.