Since the shower space in most trawlers is significantly smaller volume than in a house, an open port seems to do the trick. Some boats do have a hatch, and you could add one if needed. We have lived aboard year round in weather as cold as 0 degrees. We never shower ashore. We do not have a vent. That being said, with two people, a dog and a propane stove and oven, we do run a dehumidifier once the outside temp gets down to the mid 40s.
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