If they are on exhaust and the domes are open, any smell you have inside the RV will be originating from wherever the air is being pulled into the RV. If you have no windows open, it may be entering the coach from a basement area, through the underbelly or "who knows from where."
When the fan is pulling air OUT of the RV, you will have no smell originating from within the fan housing (or vent cover) that comes back into the RV. You could, if you have no windows open and flush the toilet, pull air down the black tank roof vent and up through the open toilet valve. That, of course would smell like black tank contents, sort of "earthy" but probably not like "dirt".....
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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