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Cooling caretakers

This is a simple method that a friend shared with me which they did during NASCAR before air conditioning. They used ice to provide the cooling, here's the diagram (sorry - not an artist).

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It's a more low-tech way than the person who shared what's used for law enforcement currently. 

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Hi Tony, we've brought your post across to the ideas phase so that the community can be inspired by what you are doing and build on it to make even better solutions. Feel free to update your post as it develops. We look forward to seeing it grow. Good luck!