I don't think it is the blower that is causing the problem because the odor arises even when it is just sitting. You are right though in regards to sucking in air during a flush. I turn the blower off before flushing otherwise it will suck air out of the black. It doesn't have a good place to pull air from.
I suppose if we added a blower to push cabin air into the bathroom it would help some but I want to find the source of the odor as it seems like with a p trap and functioning toilet seal their should be no odors escaping. Do you guys think it is possible that perhaps just the damp air is causing the problem?
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