Thanks for the suggestions on the various USB fans. I think those would be good in mild heat but I don't think they will cut it in extreme temps. I'm eyeing the Ryobi 18V P3320 fan, suggested earlier by brutalguyracing, that runs off an 18V lithium battery. It's much lighter (2lbs.) than other job-site fans and I think will make it bearable with the type of temps I'm expecting.
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