According to the instructions for my direct vent furnace, (item #4) the minimum distance from the center of the vent to the nearest corner is 16 inches. Why is that important?

I understand the minimum distance to a window/door, but this one makes no sense to me.

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    Maybe they mean an inside corner? I was thinking an outside corner. Inside would make sense. – Don Branson Apr 28 '19 at 20:49

Item #4 is referring to turbulence.

Wind does not blow smoothly past a building. It will twist and curl on the leeward side. This curling effect could “push” air back the wrong direction near the corners of buildings.

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