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Bob yes the obs is sealed except for the gap around the pier and the rear skillion roof overhang. I left those gaps to provide convection flow and they work pretty well and are still waterproof so far.
I installed one of the solar wall mount fans from ebay, its mounted up high near the peak front face of the skillion roof. I can feel the hot air being exhausted thrkugh the vent, and inside I can feel the cool air being drawn in from the pier floor gap (the obs is raised on a stump foundation so there is underfloor circulation. Seems to be working fine. The cheap unit I bought does not have a battery but that's ok it still runs until the sun goes down.
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