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Regardless of how thermally stable a material the mirror is made of, I'd still use a fully baffled fan (one you have to DIY, because mass produced ones don't come like that) to combat:
* Dew
* Inversion layer above mirror and tube currents
I have a pyrex mirror 10" and it is certainly more tolerant to temperature fluctuations than BK7 or plate glass (which my 8" is) but I still use a fully baffled fan for reasons above. And when temperature diff is great enough pyrex deforms also so can do with help from fan for cooling.
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