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Posted by Colbyt on July 3, 2009, 10:30 am
> I'm replacing an old oil furnace due to a basement flood. I'm putting
> in a gas furnace instead and looking for a used one because I can not
> afford a new one. I was offerred a used high efficiency furnace that
> was removed from a building being demolished. It's complete with the
> sheet metal.
> I have installed several of the older standard gas furnaces, but have
> never even touched a high efficiency one. Aside from running the pvc
> inlet and exhaust pipes outside rather than using a chimney, is there
> any differences or special concerns about installing a high eff. type?
> Thanks
The only two things you need be concerned about is the exhaust venting and
condensate.
Even with the fan forcing the air there are limits on the number of els and
elbows. Of course the path should always be up as with a regular vent.
You will also need a place to drain the backflowing condensate (slightly
acidic water). This may require the installation of a pump if you do not
have a floor drain and the unit is in the basement or crawl.
Colbyt
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> in a gas furnace instead and looking for a used one because I can not
> afford a new one. I was offerred a used high efficiency furnace that
> was removed from a building being demolished. It's complete with the
> sheet metal.
> I have installed several of the older standard gas furnaces, but have
> never even touched a high efficiency one. Aside from running the pvc
> inlet and exhaust pipes outside rather than using a chimney, is there
> any differences or special concerns about installing a high eff. type?
> Thanks