If your coop is well ventilated, there won't be major differences in positive or negative pressures created by the fan.
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If your coop is well ventilated, there won't be major differences in positive or negative pressures created by the fan.
Quote: Negative pressure wouldn't work either if there weren't openings in coop for 'make up air'.
Either positive or negative pressure would work about the same as far as airflow.
Negative pressure might work faster for cooling inside of coop if temp outside was significantly lower.
Actually, the problem wouldn't be pressure rather than air not moving anywhere.