Finding F-0415

“However, the carbon dioxide limit proposed by RITE, 500 ppm, is only achieved for 15.52% of the time, which demonstrates the inadequacy of the natural ventilation to fulfil the standard.”

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 15.52
Averaging time: share of monitored time over three school days
Caveat: the authors read the low share as showing that natural ventilation cannot meet the RITE limit

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.