Originally Posted by rwidman
You can't suck air out of the boat with a fan or anything else unless there's a hole for replacement air to enter. I stopped using mine because what air it did bring through the boat came through the bilge
compartment. Other than the engine
vents, the boat is air tight (more or less).
Several "Someone's" screwed up when both designing, & building your boat. As creating Good, AND, highly water
resistant ventillation for boats, is ancient technology.
Much of the time, there are even primers covering several ways on how to do it, in the West marine
catalog. At least the last time I looked.
There are even off the shelf deck
hatches which have several settings for dogging them down. Two of the 3 of them being purpose designed to allow for ventillation in most conditions, but for when green water
is coaming the decks.
That aside; Nigel Calder, the ABYC, Professional Boatbuilder
, & many, many other references
, have Loads of information on this topic.