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David, Re fans. Every little bit helps, but the factory fitted 70mm installation might not be enough to keep the dew away for much longer. It is unbaffled and probably fine to help with cooling but too small to keep the dew away for any length of time.
As our resident imaging guru Bird demonstrated for us a number of times, the temperature usually keeps dropping throughout the night and you need at least a fan so the mirror can keep up. Otherwise you will get suboptimal performance from the mirror.
But in any case, certainly the longer the scope sits outside the more likely it is to collect dew. So quicker cooling with a fan is desireable.
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