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Hi Victor,
I know what you are talking about. I too have a 16" Dob (Kriege) and have a few problems with the same thing. Even though the mirror box is open at the top and bottom, it still manages to trap air in it quite well!
I haven't installed side mounted boundary layers fans yet, but seriously looking at doing this. So I'm waiting to hear from anyone with experience too,
Clear skies
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