After 18 months, these cheap $10 3" computer fans from Radio Shack still work. I leave them on all the time (except in this photo). This one pushes out into the cockpit. One under the front cowl vent draws air in. They keep the air moving through so I don't show up to a stuffy, smelly boat. Heck of a lot cheaper than those $100+ jobs that WM sells. Can seal off the cockpit vent---- in foul weather. Lots of water could come in here in a big blow if you're pooped. This hole is where the old mechanical knot meter was located.
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