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Old 08-05-2010, 03:23 PM   #1
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Need irregular pvc elbow


I'm installing a composting toilet in a cabin that doesn't have a septic tank. The toilet requires a roof vent to carry away the gases formed during the composting process. A rough diagram of the installation is below:



The cabin is an "A-Frame" with 16/12 pitch roof. I intend to run the pipe up the wall until it reaches the roof, then diagonally along the rafters to the ridge and vent it out there. The vent pipe is 2" PVC.

The manufacturer includes two 45 degree elbows for just such a setup. My problem is that I have a cathedral ceiling with a steep pitch, so I would want the elbow to match the angle of the roof so I can bury it behind the sheetrock. A 45 degree elbow will not work for me.

The angle of the roof is 53 degrees off horisontal (37 off vertical). I am looking for some sort of swivel elbow product to junction the vertical pipe segment and the one that will run along the roof rafters at an arbitrary angle.

Can anyone suggest such a product?

Regards,
Huai

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Last edited by huai; 08-05-2010 at 03:28 PM.
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Old 08-05-2010, 03:26 PM   #2
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Need irregular pvc elbow


Can't you just use 2 45's at each end to make them any angle you need? Po)

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Old 08-05-2010, 03:28 PM   #3
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Need irregular pvc elbow


I also saw a 60 at the store yesterday....that might be close?

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Old 08-05-2010, 04:11 PM   #4
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Need irregular pvc elbow


Use more than 1 fitting and roll them to accommodate the angle
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Old 08-05-2010, 04:14 PM   #5
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Need irregular pvc elbow


That's an idea - have to contact the manufacturer to see if the exhaust fan is powerful enough to handle this.

Last edited by huai; 08-05-2010 at 04:24 PM.
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Old 08-05-2010, 04:23 PM   #6
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Need irregular pvc elbow


Use one regular fitting (22 or 45) and another street 22 or 45. One side of the "street" fitting is made to fit inside the regular one (instead of using a stub of pipe). They can then be rolled (twisted) to change the angles. Dry fit first to save fittings.
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Old 08-05-2010, 05:52 PM   #7
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Need irregular pvc elbow


I've seen PVC heated and bent to off angles in the past. Consistant heating is paramount to a neat bend.
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Old 08-06-2010, 01:44 AM   #8
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Need irregular pvc elbow


use a "swing joint" - one 90 elbow at a right angle to the roof rafters (verticle to horizontal), short nipple and another 90 pointed up the pitch of your roof. Repeat the process at the ridge. Like the center pipe layout in the image
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Old 08-06-2010, 12:17 PM   #9
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Need irregular pvc elbow


look at mcmaster car they have what you need. item# 4747T11
www.mcmaster.com

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