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Originally Posted by davidpretorius
The other thing i have noticed is that if you do seal it, then the fan must be going. Having the seal effectively insulates, so the fan must be there and on!
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On a night of good seeing where the fan had been running for a few hours, I did some experimenting turning the fan on and off and couldnt detect a difference
So yes the fan baffle will inhibit cooling compared to an open cell if the mirror isnt at equilibrium, but once its there it doesnt make a difference.
Mine sits on velcro pads and is easily removable. I'll post a pic or two when I get around to it.