Joe & Fred...
Joe, thanks for that solution (literally!). I didn't throw my vents away but didn't want to try to paint the like others have done. Now I have an alternative.Thanks, Fred! The positive effect of using the Nicro's to pull air though the boat has kept it smelling good, even in the winter when closed up. After three years I had to replace the rechargeable batteries as one had quit and the other was barely turning the fan. Otherwise they get a periodic cleaning and just keep working.