2015 27DSRL Holding Tank Vent Locations

[ScottB1957]

I purchased a used 2015 27DSRL last year and have only had a single outing in it and am very happy so far. While all tanks have been empty, I did my spring prep of bleaching the tanks and flushing the antifreeze and now I am getting a somewhat septic type of smell. I added the tank deodorizer, but does not seem to be enough. I will go topside and see one roof vent over the bathroom. Must do the grey and black water together.

Where do these campers vent gases building up on the tanks? I am aware of the make-up air check valves they likely use to avoid pulling water out of the p-traps

Any ideas where I should look? Thanks!

[ScottB1957]

I recently added a MAXX Air II Vent cover and a high velocity fan to the camper. This just happens to be near the vent cap (Really bright location)! I suspect now that leaving the fan cover open under the MAXX Air hood allows air from the vent to be drawn into the camper. May have to block off some of the cover vents on that side.

Anyone else experience this kind of back draw?

[John7349]

You can also get momentary foul fumes when the black tank is flushed and the fan is running.

[ALJO]

Each tank has a vent, look at the mushroom caps on top of the roof.