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Keeping a wintered boat well ventilated under the cover with companionway ventilation

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What is the issue?
Covering a boat for the winter period is an excellent way to keep it in good condition and reduce maintenance. However the canopy will dramatically reduce airflow and the lack of ventilation can make the boat go very stale below decks.

Why address this?
A poorly ventilated boat is likely to cause mould damage and develop a stale and unpleasant smell that is hard to entirely remove with a spring clean.

How to address this?
Add extra ventilation by replacing the main companionway wash boards for the winter with a single made-to-measure perforated board as shown in figure one.

The same approach can be applied to hatches using a securing bolt and rod that may only be undone from the inside.

Add a wire mesh to the boards if you have any concern about rodents being in the area.

With thanks to:
Michael Harpur, Yacht Obsession.

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