![What are the “recirculation” and “fresh air mode” buttons on a vehicle's air conditioner for? - CardealPage What are the “recirculation” and “fresh air mode” buttons on a vehicle's air conditioner for? - CardealPage](https://www.cardealpage.com/column/wp-content/uploads/2018/08/circulation.png)
What are the “recirculation” and “fresh air mode” buttons on a vehicle's air conditioner for? - CardealPage
![Inventions | Free Full-Text | An Overview of the Ship Ventilation Systems and Measures to Avoid the Spread of Diseases Inventions | Free Full-Text | An Overview of the Ship Ventilation Systems and Measures to Avoid the Spread of Diseases](https://pub.mdpi-res.com/inventions/inventions-06-00055/article_deploy/html/images/inventions-06-00055-g005.png?1627397578)
Inventions | Free Full-Text | An Overview of the Ship Ventilation Systems and Measures to Avoid the Spread of Diseases
![Stop spreading Corona virus on your ship - by closing your air recirculation valve in the AC room - Ship's Survey Stop spreading Corona virus on your ship - by closing your air recirculation valve in the AC room - Ship's Survey](https://maritime-mea.com/wp-content/uploads/2020/04/airconditoning-and-recirculation-system.jpg)
Stop spreading Corona virus on your ship - by closing your air recirculation valve in the AC room - Ship's Survey
![How does the recirculation mode on an HRV work, and is it safe in a cold climate? – Making Houses Work How does the recirculation mode on an HRV work, and is it safe in a cold climate? – Making Houses Work](http://makinghouseswork.cchrc.org/wp-content/uploads/2012/11/HRV_graphic.png)
How does the recirculation mode on an HRV work, and is it safe in a cold climate? – Making Houses Work
![Applied Sciences | Free Full-Text | Analysis on the Exhaust Air Recirculation of the Ventilation System in Multi-Story Building Applied Sciences | Free Full-Text | Analysis on the Exhaust Air Recirculation of the Ventilation System in Multi-Story Building](https://pub.mdpi-res.com/applsci/applsci-11-04441/article_deploy/html/images/applsci-11-04441-g002.png?1621065718)