Bottom Line: For buildings with large windows and high ceilings, opening windows can dramatically increase the indoor ventilation. However for more typical houses and buildings with smaller window, the improvement to ventilation is small minimal. Other approaches such as using HVAC or running an air purifier may be more effective.
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The link below has a video. If you want to skip to the relevant part of the video, go to about 9:30 Man Shot at by Cops Who Got Scared by an...
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