Way back when ...in the beginning of your thread you were going to use the Dorade vent for your engine area. That makes sense. I think an adjustable hatch over the cuddy area is a better application for that area. Screen, window, ventilation etc. All the beans you can eat! :joyous:
Are you adding a cooling/heating system to your boat?
In sea unless you make some type of ability to regulate it then like Redneck said...constant air, moisture, cold, hot, flows, condensate.
KC