Hi All,<br /><br />Well I just got my van and I want to install a Fantastic Vent but I'm not sure what to do about the ridges in the roof. The space between them isn't wide enough for the 14" hole I need to cut. What do you all do to fill in those ridges for a weather tight seal? I know a lot of people have put these fans in a van roof but haven't seen anyone explane how they did it.<br /><br />Thanks, Guy