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:


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.

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