RV.Net Open Roads Forum: holding tank odors entering with Fan Tasic Vent running

RV Blog

  |  

RV Sales

  |  

Campgrounds

  |  

RV Parks

  |  

RV Club

  |  

RV Buyers Guide

  |  

Roadside Assistance

  |  

Extended Service Plan

  |  

RV Travel Assistance

  |  

RV Credit Card

  |  

RV Loans

Open Roads Forum Already a member? Login here.   If not, Register Today!  |  Help

Newest  |  Active  |  Popular  |  RVing FAQ Forum Rules  |  Forum Help and Support  |  Contact

Search:   Advanced Search

Search only in Fifth-Wheels

Open Roads Forum  >  Fifth-Wheels

 > holding tank odors entering with Fan Tasic Vent running

This Topic Is Closed  |  Print Topic  |  Post New Topic  | 
Page of 3  
Next
Sponsored By:
pcm1959

home

Senior Member

Joined: 01/23/2007

View Profile


Offline
Posted: 06/01/12 08:59pm Link  |  Print  |  Notify Moderator

Ok, I have an odd situation that started on the 5th night of a 6 night trip that we just returned from. This was a 5th trip in the 2011 Carriage Cameo 31ksls fifth wheel RV and have never had this situation occur.
We shower in the RV with the bath door closed, the bathroom window open and the Fan Tastic vent fan running on exhaust. Of course, we turn water the on and off during the shower ritual.
So here is what happened. Upon turning on the shower to rinse off, I began the smell foul grey water. After the other halfs shower and investigating and experimenting the next night as we both took our showers, we determined that the odor was acutally entering thru the vent fan! I could not believe it or understand how so since the fan was running.
It seems that as the water drained from the shower pan and into the holding tank that odors were expelled out of the tank vent. That I can easily understand. What I can't understand is how the odors could come in through the vent running on exhaust.
There was absolutely no odor coming from the basement, from under the sink, the toilet, or from the shower pan. The smell was definately coming from the vent above.
The vent pipe on the roof is within about 3 inches from the Maxx Air II vent cover. We were camped on the beach with a steady breeze. But I stil can't understand how the odors come come in through the vent with the fan running. Any ideas? Thanks, Phillip


2013 Silverado 3500 DRW 4x4 Duramax/Allison
2014 Lifestyle LS36FW
Jacksonville, FL

ScottG

Bothell Wa.

Senior Member

Joined: 02/25/2005

View Profile


Online
Posted: 06/01/12 09:43pm Link  |  Print  |  Notify Moderator

This may be a stretch but on an older TT we had, the toilet had a small pencil size vent that went from just under where the water exited to wash around bowl, all the way down under the slide valve. I guess it was a vent to the tank side of the toilet so any pressure in the tank would be released rather than blow "stuff" up into the bowl or worse, your face.
Maybe your commode has some kind of vent like this?
I've looked at newer commodes and have never seen a vent like this but maybe they're hidden better.


Scott, Grace and Wesly
2003 Dodge 3500 4x4, 6 speed Cummins (lightly bombed),
2004 Forest River 25RKS many, many mods.
POS H0NDA eu2000i

ScottG

Bothell Wa.

Senior Member

Joined: 02/25/2005

View Profile


Online
Posted: 06/01/12 09:51pm Link  |  Print  |  Notify Moderator

I installed one of these timers on my bath fan so I don't have to run it while I'm in the shower (much less drafty!). At least you wouldn't have to stand in there while the smell is coming. I just turn it on for 20~30 minutes afterward. Works great for other "jobs" too.
It's rated for 120V and works great for 12VDC items.



JohnD222

Florida

Full Member

Joined: 05/22/2009

View Profile



Good Sam RV Club Member


Posted: 06/02/12 01:55am Link  |  Print  |  Notify Moderator

I have a 2010 Cameo. The factory cut off the vent pipe more than an inch below the roof panels and the hole through the roof is almost as large as the vent cap. My smell comes in just like yours, but it comes in through the entire ceiling and especially strong via the 110 circuit breaker panel.

Unfortunately the gap means moist air is always venting into the roof insulation.

I tried to replace stock vent with the cyclone, but Cameo uses a different size vent pipe than most. The cyclones work great, and 4 years ago you could buy them in 2 pipe sizes, but I can't find but the one size now.

therink

Rochester

Senior Member

Joined: 05/25/2009

View Profile


Offline
Posted: 06/01/12 09:54pm Link  |  Print  |  Notify Moderator

My guess is that the fan is causing such negative pressure in the bathroom with the door closed, it could be pulling Grey tank vaoors past the traps in the shower and/or the sink drain. It is possible.


Steve Rinker
Rochester, NY
2013 Keystone Sydney 340FBH 5th Wheel, 12,280 lbs wet
2012 Silverado 3500HD, SRW, LTZ, 4x4, Z71, CC, 6.0 Gasser, 4:10 Axle, Short bed, payload 3,900 lbs.

Take my posts for what they are, opinions based on my own experiences.


Old-Biscuit

Verde Valley

Senior Member

Joined: 06/20/2009

View Profile



Posted: 06/02/12 12:16am Link  |  Print  |  Notify Moderator

If the fan was on 'exhaust' (pulling air from bathroom area and pushing it out) then the smell from the roof vent line was probably coming in thru the 'open' bathroom window..........and you smelled it at the fan area (concentrated as it was exhausted).

Odors would have a very hard time flowing upstream against the air flow from fan.
Otherwise the fan was not exhausting BUT pulling air from outside into bathroom.


2007 RAM 3500 QC LB SRW 5.9L CTD 48re 4:10 4K in bed 'quiet genny'
2007 HitchHiker II 32.5 UKTG 2000W Xantex Inverter
Hit the Road Debt Free & Clear April '07
Came off the road still Debt Free & Clear Jan. '14


pcm1959

home

Senior Member

Joined: 01/23/2007

View Profile


Offline
Posted: 06/02/12 05:58am Link  |  Print  |  Notify Moderator

JohnD222 wrote:

I have a 2010 Cameo. The factory cut off the vent pipe more than an inch below the roof panels and the hole through the roof is almost as large as the vent cap. My smell comes in just like yours, but it comes in through the entire ceiling and especially strong via the 110 circuit breaker panel.

Unfortunately the gap means moist air is always venting into the roof insulation.

I tried to replace stock vent with the cyclone, but Cameo uses a different size vent pipe than most. The cyclones work great, and 4 years ago you could buy them in 2 pipe sizes, but I can't find but the one size now.


Interesting! I am definately going to remove the vent cap and see what I can see. It's an odd situation for sure.
I know the odor was not coiming in the window, from under the sink, the drain traps, or toilet. We took turns over the coures of several showers sticking our noses in all these areas! lol. I could place by foot over the shower drain and let water build up. Once I removed my foot and the water starting draining, the smell started. As soon as the water stopped draining, the smell stopped.
Thanks for all the replies. I'm going to remove the vent cap and see what I find and report back. Thanks, Phillip

Jim&Sharon

Arnold MD

Full Member

Joined: 04/10/2007

View Profile



Good Sam RV Club Member

Offline
Posted: 06/02/12 06:33am Link  |  Print  |  Notify Moderator

What I am going to say is just a guess, but here goes.
If your shower holding tank can not vent to the outside (clogged maybe),
then it must burp air back up into the shower stall when more shower water tries to enter the tank.
Bad venting would explain your problem.


2006 Wildcat 27RL
2006 2500HD w/Allison/Duramax
KB3TXH

Texas Two Steppers

Beaumont, TX

Senior Member

Joined: 03/30/2008

View Profile



Good Sam RV Club Member

Offline
Posted: 06/02/12 06:52am Link  |  Print  |  Notify Moderator

I had a very similar situation thinking it was the shower holding tank.
At the time I kept the grey valves open. The problem went away when I started holding both shower and galley tanks until full. I think what was happening in my situation was that deposits were being left on the sides of the water channel in the bottom of the gray tanks which started downgrade over time. Holding the water allowed a clean dump of all this stuff. I actually think the galley was my problem with food deposits.


2013 Duramax 3500 dually 4x4
2013 Excel Winslow 31RSE
TST tire monitor
Magnum MS 2012 inverter/charger
3-135w solar panels
Tristar controller
Trimetric monitor
4-6v Trojan t105 batteries
B & W companion 3000 hitch

Wills250psd

walnutcove NC

Senior Member

Joined: 08/13/2011

View Profile



Good Sam RV Club Member


Posted: 06/02/12 04:23am Link  |  Print  |  Notify Moderator

defective studder vent under one of the sinks?

This Topic Is Closed  |  Print Topic  |  Post New Topic  | 
Page of 3  
Next

Open Roads Forum  >  Fifth-Wheels

 > holding tank odors entering with Fan Tasic Vent running
Search:   Advanced Search

Search only in Fifth-Wheels


New posts No new posts
Closed, new posts Closed, no new posts
Moved, new posts Moved, no new posts

Adjust text size:

© 2014 RV.Net | Terms & Conditions | PRIVACY POLICY | YOUR PRIVACY RIGHTS