Re: Roof Vents
There are many RV vents from the salvage RV places. Repair the roof with the same metal as used by the bus maker. Make the repair metal about 6 inches larger. Add interior bracing and add a 14 inch square vent. Light and fresh air are always welcome. Most roof AC units and vents are the same physical size.
The crank vents with no fan are about $30 new. When installing repair patch, use some caulking product between the sheet metal. It will be labor saving if the sheet metal was painted before the placement. Frank