The port should also dog down cleanly, with no distortion of the frame. The gaskets in opening ports must be replaceable: they don’t last forever. An opening port can leak around the outside of the port, or at the interface between the frame and the opening part of the port. It will not always be possible to find drop-in replacements, but you can usually get surprisingly close.Ī lot of people are afraid to replace fixed ports with opening ports for fear of-causing leaks. If at all possible, replace existing fixed ports with opening ports of the same shape, and preferably the same size. Likewise, you must be very conscious of the shape of the ports. Don’t for example, install bronze-framed opening ports on a boat with plastic fixed ports and aluminum deck hardware. When replacing fixed ports with opening ports, be consistent with the other hardware on the boat. You have a similar choice of materials: plastic, aluminum, bronze, even stainless steel. You can get them round, rectangular, oval, elliptical - almost any shape. The variety of opening ports is almost endless. They are well worth considering.Įven if your boat was built without opening ports, chances are good that you can replace existing fixed ports without too much difficulty. In many production boats, opening ports in place of fixed ports are an option. Opening ports can admit a lot of air below, but they are most useful when a boat is not under way. With rare exceptions, there is no insurmountable barrier to having ventilation that’s just as effective when a boat is rail down going to weather in a driving rain as it is when at anchor. The ventilation will be different when your boat is under way than when at rest. The combination you use will depend on the deck layout, interior layout, and the way the boat is used. Almost all of these can be used either as an extractor, - providing an outlet to allow a draft to move through the boat - or as an air scoop or inlet to force more air into the boat. Ventilation can be provided by ports, hatches, variations on the cowl vent, and patent ventilators.
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