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On this forum, I believe the term "proper ventilation" defines the ability of warm moist air to naturally rise and exit the coop without placing a draft directly upon the birds. Even a $15 bathroom fan will move about 50 CFM. If the concern is about temperature, and If your coop was 10x10x8...

If your coop is well ventilated, there won't be major differences in positive or negative pressures created by the fan.

I think it best to install the fan blowing fresh clean air into the coop to avoid the dust issue.