I'd look very hard at the Nicro Day&Night solar vents.
They do work, especially if there's wind or sun.
They don't ship water in normal circumstances, but can, in extremis, be replaced with a plug.
They're cleaner and are less likely to snag sheets
They have batteries to keep 'em going all night. A good thing.
Installation is simpler . Burrowing out some core and backfilling with putty is a good idea. Inside trim rings are available.

"Skip Gundlach" skipgundlach sez use my name at earthlink dot fishcatcher (net) - with apologies for the spamtrap wrote in message news
Has anyone retrofit dorades to their boats?

We're looking at long periods on the hook, when we'll be off the boat all
day (commuting, in the Caribbean) and are looking at mold and mildew
prevention.

For whatever reason, I seem to be particularly sensitive to mold, having
just had another recurrence of a burst eardrum here at home (clogged
Eustachian tubes, infection follows, pressure builds up and necropsy
finishes it). Thus, making sure we have a free flow of air will be
important.

We'll have full awnings, but don't want to leave the boat open, nor do we
want to go to bars/grates which would allow leaving the hatches cracked/open
but (in my, prior security industry-experienced, view) severely compromising
emergency exit.

Thus the thought of dorades. Two questions about that:

Is it a big deal in our cored deck, or about the same as installing a winch
or other topside item?

If you've done it, are you happy with the outcome?

I'm thinking in terms of a couple forward, facing forward, and another
couple aft, facing aft, when we're at anchor, with caps for in and out when
we're in the Briny (I'd sure hate to dump a bucket of water down on the new
bedding!!). That, I presume, would allow for a pretty consistent air flow
through the boat. Finding somewhere to put them which won't screw up our
deck space any more than is already the case will be the biggest challenge.

So, experience??

Thanks.

L8R

Skip

Morgan 461 #2
SV Flying Pig
http://tinyurl.com/384p2

"Twenty years from now you will be more disappointed by the things you
didn't do than by the ones you did do. So throw off the bowlines. Sail
away from the safe harbor. Catch the trade winds in your sails. Explore.
Dream. Discover." - Mark Twain