Finding · as stated by the study, recorded by Coridum · status verified-machine
Finding F-1383
“the average particle number concentration was approximately 57% lower compared to the value measured in the closed condition with no natural ventilation when one air purifier was operated (Cases 2 to 5 vs. Cases 11 to 14) and approximately 52% lower when two air purifiers were operated (Cases 6 to 10 vs. Cases 15 to 19).”
Structure
- Factor
- Ultrafine particles (UFP)
- Intervention
- Air purifiers
- Setting
- classroom
- Study design
- experiment in a classroom with a heater: a virus-containing aerosol was generated and the particle number concentration measured under nineteen cases combining closed windows, natural ventilation through windows opened to a third of their width, and one or two air purifiers in different positions (class 3)
- Effect
- difference 57
- Caveat
- an aerosol released on purpose in an empty classroom, not an occupied 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.