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Originally Posted by janoskiss
A large (90+mm) baffled fan behind the primary blowing air up the tube would help. But do use one large fan instead of multiple smaller fans like I did (for reasons I'll post about another).
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Steve our Dob has a 70mm cooling fan already fitted do you think this will solve the problem. Or should we try to source a larger fan.
We haven't bothered to use it as a cooling fan because we place the dob outside well before viewing to give it plenty of time to adjust to outside temperature.
David