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As we make homes more and more airtight, ventilation becomes increasingly important. We need to keep replenishing the oxygen that keeps us alive and removing the carbon dioxide that makes us drowsy. We also need to flush out the odors and other disagreeables in the air to keep us healthy and happy. Standards provide some guidance on how to do that. They also help protect you from lawsuits.
Let's start by sorting out the morass of information on ventilation standards so it makes some sense. It all starts with knowledge, and Donald Rumsfeld gave us a great way to think of it when he talked about the known knowns, the known unknowns, and the unknown unknowns.