The roof vent fan I had installed on my Sprinter several years ago has had some issues with leaks. Finally decided it was time to resolve that and put in a new fan.
The new vent fan is a Maxxair from Maxxfan. I am very happy with the design of this fan, hope this one doesn’t leak! However…. the leaking of the old vent was more of an issue with the installer (me) than the fan. I got in a hurry when I installed the original one and didn’t use the recommended sealant. As is often the case with rush jobs they don’t turn out well!