![Ministry of Health | Rwanda on Twitter: "#COVID19 spreads more easily in 3 Cs: Crowded places, Close-contact settings and Confined spaces with poor ventilation. Avoid them. #Sindohoka https://t.co/cQ17lBgBP3" / Twitter Ministry of Health | Rwanda on Twitter: "#COVID19 spreads more easily in 3 Cs: Crowded places, Close-contact settings and Confined spaces with poor ventilation. Avoid them. #Sindohoka https://t.co/cQ17lBgBP3" / Twitter](https://pbs.twimg.com/media/E4Fo6i2VgAExVdL.jpg:large)
Ministry of Health | Rwanda on Twitter: "#COVID19 spreads more easily in 3 Cs: Crowded places, Close-contact settings and Confined spaces with poor ventilation. Avoid them. #Sindohoka https://t.co/cQ17lBgBP3" / Twitter
Improve Ventilation Tool | Having visitors in your home this winter? While opening windows can improve ventilation in your home during the visit, it might be too cold to do so...
How does bad ventilation spread Covid? Govt's principal scientific advisor explains | Latest News India - Hindustan Times
![Window fans may be Philly's fix for schools with poor ventilation. But teachers and parents are saying no way. Window fans may be Philly's fix for schools with poor ventilation. But teachers and parents are saying no way.](https://www.inquirer.com/resizer/r_0PUja8TSMg1NaG5schntUhLCE=/760x507/smart/filters:format(webp)/cloudfront-us-east-1.images.arcpublishing.com/pmn/DK3ILSGFKNCTDCF42WL3AEPNJY.jpg)
Window fans may be Philly's fix for schools with poor ventilation. But teachers and parents are saying no way.
![Indoor Ventilation Strategies to Reduce the Spread of COVID-19 at Home | Belfer Center for Science and International Affairs Indoor Ventilation Strategies to Reduce the Spread of COVID-19 at Home | Belfer Center for Science and International Affairs](https://www.belfercenter.org/sites/default/files/styles/large/public/2021-04/graphic%204%20ventilation-4.png?itok=hFBly_gH)