I installed one of these 2 years ago & love it!
Specs (see link) call for a 4.5" cut out. It has a switch to turn it on/off, and comes with two fan setups - one for intake, and one to exhaust - works great even under my white winter tarp. I just checked the boat an hour ago, and the fan was exhausting just fine.
eBay Motors: STAINLESS SOLAR POWERED DAY / NIGHT DECK VENTS 13027 (item 330301805355 end time Jan-25-09 18:34:51 PST)
Last edited by jimq26; 01-23-2009 at 05:41 PM.
Reason: add more details