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1 Answers

You put the inlet (and outlet or exhaust) far away from the shelter and connect that duct to just a hole or its own room. Then, a separate pipe is used to draw air from that inlet chamber. Yes, a very unlucky indirect hit can kill your air system, but you'll have plenty of time (hours) before the air runs out or you should be able to turn your outlet into a temporary (days) inlet.

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