I have installed the (very expensive) Nicro solar powered vents (or intake -- comes with two easily switched props for in or out) -- in my first M-15, then my Cape Dory Typhoon, then in my old wooden Cape Cod Catboat, and now in my current M-15. They do not make enough breeze to cool you, but I like the continuous change of air to keep the boat from getting that musty smell. I also have installed the smallest Radio Shack muffin (brushless) fan in the aft end of the starboard bunk locker, hole from from the forward end of that compartment into the middle compartment (which I leave without the screws holding it down and use as an additional storage locker), thence through holes in the front and back of the port under-bunk locker. Now all three compartments stay ventilated and sweet. Unfortunately Nicro's warranty seems designed to expire shortly before the fan gets noisy bearings, or the finite-life solar cell expires. Ain't they clever? "If you don't learn something new today, you aren't paying attention" John R. Butler, theoldcat@cox.net