A nearby college includes a building, surrounded by an outdoor arcade, at street level. At one point, the warm internal air is expelled, which is natural, they perform continuous circulation. A nice spot, on a cold night!
However, I wonder, is there any hazard in breathing that air? Is it chemically processed somehow, contaminated? And, isn't it inefficient? The outgoing air ought to pass through a heat exchanger, to warm the incoming air. Isn't that wasted energy?
possibly it has less oxygen that fresh air, possibly stink and virus particles?
It might be, it depends if their AC is heating or cooling
Usually the air is passed through a heat exchanger so some of the hot inside air will heat the cold outside air before it enters the building.
There is no chemicals involved. You will be exposed to a combination of all the air in all the rooms in the building. Could be a good way to contract any virus that anyone in the building has.
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