Joe, I have the 3" Day/Night Plus, which I installed in 2006. It replaced the original Day/Night 2000 which I installed in 2000. They last a long time, but not forever. As I recall, the old one gave up charging for some reason. (My 13 years should be corrected to 12). I've never noticed any evidence of water intrusion. The air flow path leads down and horizontal at the outlet, so it would take one heck of a blow to force water back through the fan. Rich -----Original Message----- From: montgomery_boats-bounces@mailman.xmission.com [mailto:montgomery_boats-bounces@mailman.xmission.com] On Behalf Of Joe Murphy Sent: Sunday, September 30, 2012 9:27 AM To: For and about Montgomery Sailboats Subject: Re: M_Boats: M15. Air circulation in cabin Rich, Which size Nicro Solar Vent did you get? Do you ever have any problems with water intrusion?? Thanks, Joe ----- Original Message ----- From: Rich Makela To: 'For and about Montgomery Sailboats' Sent: Friday, September 28, 2012 11:07 PM Subject: Re: M_Boats: M15. Air circulation in cabin Tim, My M17 has a Nicro Solar Vent mounted in the overhead hatch cover. It's a battery-powered fan with a solar charger that runs 24/7 all summer. I also installed a couple of louvered vents at the bottom of the entry hatch cover to let fresh air in. It has worked great for 13 years. Rich Makela M-17 Harmony -----Original Message----- From: montgomery_boats-bounces@mailman.xmission.com [mailto:montgomery_boats-bounces@mailman.xmission.com] On Behalf Of Tim Erwin Sent: Friday, September 28, 2012 9:49 PM To: montgomery_boats@mailman.xmission.com Subject: M_Boats: M15. Air circulation in cabin I would appreciate any feedback on the subject of getting air moving in the cabin. Thanks. Tim Sent from my iPad