A lot of writings concerning BMW Boxer maintenance advise having fans/blowers set up to keep the engine from overheating. Barbi found these for me at Wally World the other day and they fit the bill perfectly - plus they also have a couple of outlets built in. I used a carb sync session as an excuse to test them out.
It was almost 100 degrees, ambient, when I did the sync and when I was finished I could still comfortably place my hand on either valve cover.
I think that at a little over $40/ea these are just the ticket. Plus, they move quite a bit of air and can be used to speed up carpet drying after a cleaning...