Here is a fan that is quiet and uses 40 watts. http://www.thermastor.com/DesktopDefault.aspx?tabid=211
Controlling relative humidity in a crawlspace is more than ventilation. Ventilation using outside air only helps when outside is dry. Cover any exposed earth with plastic. Close outside vents, dehumidify is necessary to keep the %RH Below 60%RH.
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