Ventilation became a high priority after sailing in rougher weather to the Azores. The cabin was stale and claustrophobic! We now have three air-only ventilators (watertight even in a capsize). Two vent cowls were added for the main cabin, and one low profile vent with electric fan was installed for the head.
Cutting holes in the boat!
Vent placement near dinghy to protect from entangling lines
Core filled with epoxy
Installing and cutting vent tube
Smiles
Air-only vent insides
Next piece
Butyl!
Air-only ventilators finished
We also added a new hatch under our nesting dinghy. Because of its protected position, this Lewmar Ocean 30 stays open in most conditions (when the dinghy is stowed). In combination, the new air-only ventilators, small protected hatch, forward hatch, and companionway complement 4 original port holes and give Dawn Treader many ventilation options.
Position for hatch frame
Cutting another big hole in the cabin top
View from below
Deb rounding the corners
Frame epoxied in place
Dry fit
Provides ventilation to main cabin salon, and galley
Dinghy in place over little hatch, experimenting with lashing
Protected by the dinghy, with large slot for air flow
Lewmar Ocean 30 has perfect dimensions for opening under the dinghy
Hatch installations complete!
sailing dawn treader 
Oh boy Padagonia , I am jelous and can’t wait to hear and see your adventures . Got back from my navigation class in USVI and now I know that “True Vergins Make Dull Companions , add Wiskey ” Of course there are some more political correct ways of remembering this acrinon , oh well.
Working on my aft water tank now and moved two cockpit thrue hulls aft to start with the raised cockpit sole like did in preparation of the new watertight companionway hatch . So your sink does not drain out anymore ? Is that what the bucket is for ? Thanks for your blog and sharing your improvements with others , Harald triton #405
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How have the Air-only vents held up over time? Considering purchasing some of the low profile ones. Thanks
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They have held up well. After two year they are as new. The low profile is quite strong but the cowls give a lot more air.
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