Joe-FL may have something on keeping fan running. I just installed cover for vents so we could keep them open while motoring or when there is rain etc. DW flushed toilet while we where moving and because of the air suction from vents we immediately smelled the black tank. I have never had any odors till this happened once we closed vent there was no more odor when we flushed. On our way to FL panhandle.
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