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Is using water cooler fan in my computer room HARMFUL for the internal parts of the computer system?

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up vote 3 down vote accepted

An evaporative cooler can be if it causes the humidity to rise too high (above 60% or so). If humidity is not too low in the server room (20% will cause static generation to increase) then you should consider using refrigerative cooling instead.

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For starters, read up Is humidity a problem for PC's?
Remember, if you start controlling humidity -- very low humidity can cause static-charge related problems too. And a fluctuating humidity might lead to condensation related problems.

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