Where can I find information on how to correctly vent a gas furnace to the
outside. Right now there is a dryer type vent on the outside of our house,
but most people have a metal duct extending out though the outside
wall(although that doesn't look good, appearance-wise.) Thanks for any
It depends on the furnace. Some vent into a chimney, some use a power
venter that is built in that COULD vent through a wall. The ones that
use plastic pipe (90%+ Efficiency) are the easiest. You would be best
contacting the contractor who installed it. Some that use metal pipe
use type B vent which is double walled to keep the outside of the flue
pipe cooler. There are code requirements on how close the metal pipes
can get to combustible materials. Also sizing and max number of
fittings and max length restrictions, even for Plastic, low temp flues.
Not often a good DIY project. Different brands, models and sizes are
You start with the installation manual for your specific furnace.
Different models require different vents. You also need to meet all local
codes controlling vents in your area.
I highly recommend that if you have any question at all about how to do
this, that you have a professional handle it. It can be deadly to be wrong.
Search google.com for the manufacturer of your furnace. See if they have an
installation manual for your furnace on their web site. Or call and ask
them. (I keep instruction and installation manuals for everything I
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