Mine is a 325gal in-wall system with a 50 sqft equipment room. A 110 CFM bathroom exhaust fan blows out the hot humid air and a 4" hole in the exterior wall of the house allows fresh air to be drawn inside. Humidity doesn't exceed 45% but room temperature due to MH lighting climbs to around 30 C each day. I'm going to try a 300 CFM fan and if that doesn't work... LED lighting is in my future.
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