Ever since I was a kid I always wondered how people are not suffocating from staying in their house. Like if all windows are closed how does air get in? Wouldn’t we just breath up all the available air in a matter of hours and die? Same goes for cars too. If I’m on a long road trip and the windows are closed how am I still alive?
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Windows tend to be pretty airtight but if you look at your doors you’ll probably see some spaces at the bottom where air is getting in. Garage door and front door are good examples.
Air also gets in through bathroom ventilators (the fan that runs when the lights are on) and most attics have open vents for dispersing heat build up.
Lastly you have your oven ventilator and the exhaust for your drier.
Air pressure differences inside vs outside move this between these spaces.
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