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The problem is the room is really musty, and the room sometimes gets moisture from the rain. How do I ventilate a room like that? I am a total amateur at this. Do I drill a hole through the roof and have a ventilation fan push air out a curved PVC pipe?.
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I would cut two vents one on each end of the walls and under the porch.
You will have to rent a concrete saw. Get the vents at one of the big box stores. You can get one with a humidistat and a fan if neccessary. They even make one that opens automatically.
But I'm thinking since their are no vents their at all now. Just regular crawl space type vents should work fine. They are about 8"x16" over all. They will have luvers that can be closed from the out or inside. They will also have screen on them to keep insects out.