[Shop-talk] PVC Vent Run

[Brian Kemp]

You can easily make a 95 degree elbow with a pair of 90s as suggested.  
Make one of them a street elbow and the pair of elbows will be much more 
compact.  I do this with sprinkler pipe on slopes.

I've bent lots of PVC with a cheap heat gun from Harbor Freight. Lay it 
on a concrete slab and roll it slowly back and forth as you heat about a 
foot of it for 1-2 minutes and it should bend easy and cleanly.

Check code, but having elbows at the top to make a "U" may violate 
code.  It did many years ago for a plumbing vent.  The proper top would 
be better,  if you can't find one easily, I'd consider using a "T" so 
there is no requirement for the air being vented to change directions 
and flow down.  A "T" will stop rain entry, but not hinder air exit.

Brian

On 7/18/2017 7:36 AM, Jim Stone wrote:
>
> I need to refine the vent for the water heater in my garage that 
> provides heat for the radiant floor heating system and on demand hot 
> water for the attached living space.  Right now, the 2 inch vent goes 
> straight out the wall, but the building code requires that it be 2 
> feet from a vented or unvented soffit, which means that the pipe 
> currently sticks out about 3 feet from the outside wall. It is high up 
> enough that safety isn’t an issue, but it looks really crappy and I’d 
> like to do something better.  I think the best solution is to install 
> a 90° elbow, run the pipe a couple of feet away, and then go straight 
> through the soffit and vent vertically with a couple of elbows at the 
> top to form a “U”.  (The design of the building doesn’t allow me to 
> simply elbow and go straight up from the current location.)  Now, 
> here’s the problem:
>
> I can accomplish everything described above and still stay within the 
> maximum length for the vent pipe plus the elbows. However, the 
> manufacturer also specifies that the run should be pitched back 
> towards the unit ¼” per foot so that condensation runs back down and 
> drains.  I have room to do that, but a 90° elbow off of a pitched 
> horizontal pipe would put the vertical run at a similar angle.  (I 
> hope that makes sense.)  It would seem like I need something like a 
> 95° elbow.  Does such a thing exist?  I MIGHT have room to elbow out 
> and up to eliminate the problem, but that would look like crap and the 
> extra elbow would impact the allowable run.  I have tried heating and 
> bending PVC before, but that doesn’t work very well.  Since pitching 
> pipe for drainage is a common requirement, I have to assume this isn’t 
> a unique problem.  How do I handle it?
>
> Thanks,
>
> Jim
>
>
>
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