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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Also to mention typically cars will have fresh air coming in from the HVAC system and there is usually a small flaper door in the bottom of a rear quarter panel to vent air out.
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