Hatch vents
I put one in the forward hatch of my 35, and I put a passive vent in the cockpit at the aft berth so air would be pulled thru the interior. Makes a huge difference on mildew in the summer. If I leave thevent closed, get mildew growing thick in just a few days. With the vent open, none at all.Nicro may have updated their models, but I got the biggest (square shaped) one for two reasons, one its a little more powerful, and two, you can close it to green water by just sliding up a built in ring. With the round vents the green water seal is a separate piece I was afraid I'd lose.Hint on installation -- spend the $15 and buy a round drill bit (4" or whatever size they recommned) as opposed to cutting the hole with a sabre saw. Cutting the acrylic with a sabre saw is a pain in the ass as it melts and reseals, and invariably you won't get it quite right.