4 ms·
Here are the actual guidelines: https://www.cdc.gov/coronavirus/2019-ncov/community/ventilation.html https://www.cdc.gov/coronavirus/2019-ncov/community/ventila
by jefftk 3y ago
Here are the actual guidelines: https://www.cdc.gov/coronavirus/2019-ncov/community/ventilation.html https://www.cdc.gov/coronavirus/2019-ncov/community/ventilat...
Note that when they say "5 ACH" they include both actual air changes and "effective air changes" due to filtration or germicidal UV:
"Some air cleaning and air treatment devices do not bring in outdoor air. Instead, they clean or treat the indoor air to reduce the concentration of infectious particles. Thus, they give eACH without the need or expense of conditioning outdoor air."
- bgentry 3y agoWhich is fine for filtering particulates, but does nothing to resolve the issues of CO2 buildup, natural gas appliance fumes, formaldehyde from composite wood products or other off-gassing, etc. For proper indoor air quality you need both filtration and fresh air intake.
- gniv 3y agoAlways-on air purifier + opening windows a couple of times a day is cheap and effective.
- jefftk 3y agoSure, but that is less the remit of the CDC.
- Abekkus 3y agoYou want about 15CFM fresh air per person to address CO2, which is 14x less outdoor ventilation than 5eACH recommended interior filtering & ventilation. For my small, crowded house, at least.