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Ola, Victor,
My big 17.5" newtonian doesn't have fans as it is so open that it cools quickly for me as it is.
All the fans do is move air to cool the mirror to ambiant temperature. I would have thought that introducing cool air into the tube would cool the mirror faster, also pushing out the warm air in the process.
If your scope is totally open, I really don't see the need for cooling fans. They may, however, help reduce dew forming because of the air movement. Any ideas on this, Victor, anyone?
Alejandro.
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