Pressured bug flow is an interesting phenomenon
involving 3 things: an enclosure, a security light, and
flying bugs. The enclosure needs to have a pressure
less than the pressure outside the enclosure, a door, and
the security light naturally should be directly above the
door. Here is what happens:
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Bugs congregate at the security light, as they
naturally do at any light source. As you attempt to exit
the enclosure, air rushes into the enclosure due to the
pressure differences, taking the bugs with it. Much worse
than a swarm of bugs, you end up with a pressured flow of
bugs running into your body. Most often happens in
industrial areas, due to fans sucking exhaust from the
enclosure.
All you can do is close your eyes and run quickly.