Most of the runs of PVC I've done have been horizontal, out
a side wall. I can't say as I've ever exhausted flue gasses
out a roof. High on the garage side wall sounds like a good
choice.

--
Christopher A. Young
Learn more about Jesus
www.lds.org
..


"jamesgangnc"
wrote in message
...

sloped properly and condensation does drain back) The part
of the exhaust is
the verticle section coming up through the roof...The
verticle section rises
about 5 feet over the roof so that it won't be buried in a
snow


Find a new run for it. In many cases the outlet does not
have to go
up and out the roof. You can run it out the side as well.
Run it out
the side wall high up on the garage and you'll still be
protected from
snow accumulation without having to extend the pipe into the
open air.