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There is a believe that doors opening out facilitate the way out in panic moments, particularly into crowded places, such as commercial buildings. Because of that it is mandatory in some cities around the world that commercial buildings bigger than a given size open doors out. Now a doors that opens in is safer because it is harder to dismount it from the outside. That is why houses open in. Fire code in all US jurisdictions requires doors in perimeter walls on commercial buildings to open in the "direction of travel"--IOW, outswing. This was implemented in the aftermath of Boston's Cocoanut Grove fire, where 492 people died in 15 minutes of smoke inhalation, and Chicago's Iroquois Theatre fire, where 602 people died in 20 minutes of smoke inhalation and/or burns. Residential doors are inswing in part so you can install a storm door on one.

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