24 volt fan

[Patrick]

He wants to cool it, not turn it into a helicopter:005:

I use a 60mm 12V fan on two 8.4V batteries (9V size) wired in series and it works pretty well. The over volting has seemed to hurt it in 2 years or so.
My system doesn't really get dangerously hot with out it, but it makes such a big difference to temps that I can't make myself get rid of it.