It is a attic vent have 3 of them in my CC and FR has been using them for a few years now the take the condensation out of the roof. SO if you need parts ask FR or try a bib box store, they should not be that hard to find.
Also tell your friend to look up more often and this will not happen.
2010 Cedar Creek Silverback 35ts
2001 GMC 2500HD w/ Allison & 8.1