From: "TH" 
Newsgroups: alt.hvac alt.home.repair misc.consumers.house
Subject: Re: Question about high efficiency Furnace Exhaust
Date: Wed, 17 Jan 2007 16:15:17 GMT


"Pep"  wrote in message 
news:1169005734.033691.160880@38g2000cwa.googlegroups.com...
>I have had two contractors in to price out a new high efficiency (90%)
> gas furnace for my 25 year old home located in Calgary Alberta.  So we
> get some pretty cold days
>
> Both have said that a new horizontal exhaust is required out the side
> of the house.  Both contractors will also drain condensed water from
> the furnace to a floor drain inside my basement.
>
> One didn't recommend the high efficiency furnace.  He said that the new
> exhaust will produce a sizable condensation cloud which will frost over
> a window which is about 3-4 feet above the exhaust.  As well he thought
> condensation would freeze on my neighbors house which is about 6-8 feet
> away.
>
>
> Does a high efficiency gas furnace really produce a cloud of
> condensation? (It gets quite cold here, with a lot of freeze thaw
> cycles over the winter)
>
> Would the furnace exhaust come out with enough force to frost up my
> neighbor's exterior wall 6 feet away?
>
> thanks
>
Be careful of CO if you open the window during the heating season.