Roof Vent Cover

They are generally a 14” x 14” square opening. If it has the little fan in the corner it might be a Ventline . Check out this one from amazon Camco vent lid

They are easy to replace. Consider a Fantastic fan. It really moves air.

Those are generally available at a decent price at any RV dealer. If you have the luxury of time you may be able to find a better deal on the Internet. As SteveB noted, they're 14 x 14. Check the hinge on your current vent lid to make sure you get a compatible replacement.

First see what type vent lid you have using this


For long lasting vent covers Polycarbonate ones are the ones you want.


If you haven't done this before Here is a short video that will help you.

You may need a new seal that goes on the metal edge this will make it a tight seal This is what you need

Replace like this

Maxx Air covers are also a good Idea,mine have been on for 9 years and look good as new.

+1 on the Maxx Air cover overtop the vent lid. The lid will still open enough, but you can leave that lid open in any weather (in rain, even during storage) for ventilation.