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Old 09-24-2022, 04:40 PM   #1
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Side Vent for gray water tank

I'm installing plumbing in a vintage camper that has a definite curve from the side to the roof. The location of the gray water vent pipe hits right in the middle of the curve. Any reason I couldn't stop the vent pipe just below the beginning of where the side curves up and have it vent to the side? I know the reason for having the pipe vent through the roof is it disperses the small better from on top.
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Old 09-24-2022, 10:11 PM   #2
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Is there working space available for you to install a flexible vent, and lead it over to the flat roof? A vent line holds nothing but unpressurized air.
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Old 09-25-2022, 05:49 AM   #3
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Morning John, I'm restoring a 1950 Vagabond and they have what I call a birdcage steel frame. I'd have to cut through a frame bar to do that and I really don't want to. It's possible to run a 1" OD tube but I'm not sure that's big enough. Might be for gray water but I'm installing a macerator toilet and it will be pumping in the sludge through a 1 1/2" pipe. The side vent would be 12" from the top. I can't see any reason that wouldn't work but then again that's why I'm asking the pros here!
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Old 09-25-2022, 01:53 PM   #4
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How was the Vent Piping run OEM on that 1950 Vagabond?

**Airstream uses roof venting ---not sidewall vent

Fridges installed in slide outs use sidewall venting and have problems with DRAFT hence the reason Fans are used

Waste tank venting is dependent on natural DRAFT

1 1/2" vent piping is used to allow for natural draft
Smaller pipe....less venting action

Sidewall....might work ok when trailer is parked
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Old 09-26-2022, 04:49 AM   #5
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Thanks for the input. Like most trailers from the later 40s and early 50s, there were no holding tanks. I have a 1955 Wally Byam Holiday with a toilet but they didn't have holding tanks either. So there were no vent pipes in my 50 Vagabond. The vagabonds, while pricy trailers didn't have anything but a kitchen sink until later in the 50s. The 55 Holiday did have a toilet and I added a holding tank below the frame but vented it through a low side vent. I added a bilge exhaust fan to vent both the tank and the battery box. At the time, my Holiday was the only one known to exist and written up in Airstream Life Mag so I didn't want to make any alterations that weren't original or at let couldn't easily be put back to original. The hole in the side was much less noticeable than a vent pipe.
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tank, vent, water

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