7 ms·
Modern homes in Germany have ventilation with heat exchange which have some sort filter system. https://de.wikipedia.org/wiki/Kontrollierte_Wohnrauml%C3%BCftun
by lucioperca 3y ago
Modern homes in Germany have ventilation with heat exchange which have some sort filter system.
https://de.wikipedia.org/wiki/Kontrollierte_Wohnrauml%C3%BCftung https://de.wikipedia.org/wiki/Kontrollierte_Wohnrauml%C3%BCf...