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Hi Tony
Half the volume of your shop divided by 60 gives you a 189 CFM fan, I would tend to undersize this a bit? try and get the fan near the floor and provide an opening as high as possible, on the opposite end of the building to try and pull some warm air off the ceiling. The problem with the smaller fan is it will take a long time for it to catch up or remove alot of condensation. If the fan is too big it will ventilate the shop quickly but your heating costs will soar. The trick is to let the fan run constantly before and during the times when the weather conditions produce condensation and leave it off the rest of the time.
I would try and find a smaller fan and do a temporary setup, it might take a few days to clear up the condensation. How much heat do you have for the shop and what type of system is it??
A large good quality bathroom fan runs around 150-200 cfm range, the other option is to find the smallest furnace blower you can and run it its lowest speed. You can get these at the junk dealers, scrap metal yards or from the local heating contractor. (used of course from a defective furnace)
Cheers
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