I vented mine out the back of the boat. Two 1/4" Nylon tubing lines run out through the transom. Used a regular bulkhead fitting (like for a bilge pump discharge) with a wood dowel plug drilled to provide two 1/4" holes for the tubing. Works great.
http://files.triton.net/old1/vent.jpg
This was recommended by Joe Mondello for the exact reason you have described.
Roger