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veen · 1450 days ago · link · · parent · post: PSA: Why Is the Risk of Coronavirus Transmission so High Indoors?
If you dig deeper, you can find out why it does that: this Zeit article is based on this Max Planck Insitute model which points to this scientific article which has the ventilation assumptions in table 3. 'No ventilation' is replacing air 0.3 times per hour, 'Active ventilation' (windows open) is twice per hour, and 'Ventilation system' assumes nine times per hour. kleinbl00's bitchin' medical-grade system does 11 per hour, so no, regular people don't have that system. I'm pretty sure that, since home ventilation systems are very rare in Germany, this is a lost-in-translation thing where ' ventilation system' means something else to you than to bratwursteaters.