HOw big is big enough - fan for use with indoor trainer?

[g-boaf]

I am certainly not regretting getting the 280W 75cm Arlec monster. The airflow is good and so is the remote control. And it's actually quite nice for cooling my office on other days too!

That's the one I have. It is very good. Smaller fans are just not powerful enough, don't give enough cooling and then you end up overheating. As Alex has said before, cooling is really important.