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With my 12" dob I leave the fan running all night and have NEVER had a fogged up mirror. Even in frost and -6c temps.
The few times I have had my mirror fog up is when I forgot to turn on the fan.
It's not so much that the fan is cooling the mirror to prevent fogging, but that there is an airflow around the mirror.
Fogging will not occur when there is airflow.
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