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Discussion Starter #1
Inside commercial class B's, I've seen a variety of small vents in the bathrooms. But when I look for solutions online, I don't find much.

Found a couple small electric vents that specifically say not for use in wet areas like showers and bathrooms. Not sure if the vents I saw were electric or not. I found a small solar vent on etrailers that they recommend for bathrooms, but it won't work at night or when cloudy.

Any ideas on sources for this, or if these might be a ducted or passive solutions? I rather not have two 14" vent fans in close proximity, one for the galley, the other for the bath. Seems like overkill. Could share a single fan between them, but it feels like these should be separate.
 

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Ziggy, assuming you are talking about an enclosed bathroom, you might want to consider a door "slot" below for air intake. On upper bathroom wall a well placed computer fan would exhaust stink (or moisture when showering) when aimed towards a nearby 14" ceiling exhaust fan. I have not done this, yet, but in travel trailers, cooking odor/smoke are easily whisked away by a 14" roof fan on high. Just be careful as these fans exhausting on high have been known to take small dogs landing on RV roof.
 

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2014 3500ext Gas - VA
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Ziggy,
I use a single 14" fan that "straddles" my wetbath and kitchenette... pics are available here: https://vancave.wordpress.com/cargo-van-overview/cargo-van-hvac/

Given my layout, the fan placement works very well to vent bathroom and cooking odors.... but doesn't do much for venting the very back of my 3500 ext van... I fix that with a simple $10 12v circulation fan.
 

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Discussion Starter #4
Thanks guys. I'm mostly worried about moisture. Stink I can handle with three dogs.

Still debating fully enclosed or not on the bathroom. Initially looking at rv tub with an open shower with nested open privacy and shower curtains. But when I look at the floor to ceiling wet enclosed baths in commercial RVs, I wonder if they know something I don't vis-a-vis moisture.
 

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We used a bilge fan for odor extraction in the enclosed bathroom in our Sprinter. (https://sprinter-source.com/forum/showpost.php?p=276879&postcount=281) It's in the wall and we used a trailer vent for the outside weather protection. We are in the process of getting vents from GNC-systems.com in Holland. The samples look good and their Turbo-II fan is a good passive ventilator. We have made adapters for the Flettner and Ventline vents as well.

[ame]https://www.amazon.com/gp/product/B006R5LLLY[/ame]
[ame]https://www.amazon.com/dp/B003EX02DA[/ame]
 
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