Just a swag here, but if the smell occurs only when running the furnace, maybe you are pulling a negative pressure inside which will pull make up air from your tank vents. Sometimes the culprit is the vent under the bathroom sink that ties to the black tank. You can open a roof vent or window while the furnace is running and see if that eliminates the smell. If you feel an inrush of outside air it may be a tip off also.
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Former owner of 2015 Thor Vegas 24.1 in Ocala
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