I used my fans almost every day 1/2-1 1/2 at a time for 3 weeks at water park work. It was great and I had a few people wanting to buy it. Then I turned it on after 3 days of non-use and it makes a terrible howl. This fan has a limited lifespan. I sold about 25 people with it and now I'm worried the fans won't last long.
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