On Dec 16, 10:11*am, "Jim" nospam@wherever wrote:
* * *Hello,

* * * *I just had the furnace guy refire up my energy efficient furnace as
it went out last night. We have been having a cool spell (-45 to -50
Celciuse) in Canada here... I have a 2600 sq ft four level split home and
they installed the new furnace last year and I have these three inch plastic
pipes as an intake and exhaust. Problem is the exhaust had to be run for
quite a ways (through the garage and up through the roof) for the
installation and the very top of the exaust is freezing over (The exhaust is
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
bank........This morning we cut two feet of length as the end of it iced
over and closed the exhaust. I don't know weather to use heat tape on these
three inch lines or just wrap with insulation.... Thoughts...typing with
gloves on here...just got things up and running again...close call...laying
in bed this morning and our cat came to bed and noticed he was cool to the
touch...LOL...lucky I didn't freeze any pipes Thanks..... Jim

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.