As far as the directions of the vents, I wasn't concerned with water pouring into the bilge but just some spray dripping into the engine compartment. I figured it was best to keep as much salt water out as possible even if it were just a small amount.
I can see the point about it ventilating the bilge very well on the way to the ramp when one vent is facing forward but when running out on the water the engine will clear the bilge better than any vent.
I'll probably turn one of them around and add a blower.
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