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Old 07-25-2016, 04:36 PM   #1
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2007 27' Classic FB
Mora , Minnesota
Join Date: Nov 2015
Posts: 11
Black tank vent

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Can someone explain to me which vent is what on my 2007 Classic Ltd FB? I am having issues with sewer smell in the coach following traveling and have ruled out (I think) dry P valves as a cause. The front of the trailer is to the right.

The center black vent in the photo is the fan with the push button on it located in the bathroom ceiling. It seems to be able to be popped up or down. How do I know what position to put it in? When I began running this bathroom fan, the smell does seem to evacuate the coach pretty quickly.

How about the other two white vents on either side of the black one-- is one of these from the black tank and another from the grey? Anyone have experience with those 360 degree 'tails' to help vent the black tank? Trying to get to the bottom stinky stink stink I've been having...

Thank you!

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Old 07-25-2016, 04:40 PM   #2
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1991 34' Excella
2009 34' Panamerica
Telluride , Colorado
Join Date: May 2012
Posts: 1,689
It would appear the exhaust fan might be sucki g in black tank stink from the ajacent black tank vent.... who thought this was a good idea?

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Old 07-25-2016, 09:00 PM   #3
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2007 22' International CCD
Corona , California
Join Date: Jul 2013
Posts: 2,252
Black tank vent

Exhaust fan should be blowing air out on roof when running. If it's off, open, and close to the vent, and some other vent is blowing air out of AS, stink happens...

If it's like mine, to close it, turn it off, and pull the handle down to shut the cap.

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