It’s amazing what fresh air can do. The lungs (and entire human body including the immune system) are a complicated piece of biological machinery and the more fresh non-contaminated air you can supply your body with, the more likely you are to get well (or remain that way). Keeping a breeze blowing through an area is effectively critical when it comes to keeping infection down (and maintaining health in general). The idea of negative pressure in a sick person’s room from blowing a fan out the window is a great idea. How can you recover from a respiratory infection without a clean supply of air? Thanks for the information.