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Proper
Venting Necessary When Replacing a Furnace ..
All
furnaces, regardless of what type of fuel they burn, require
venting to remove the byproducts of combustion from a home.
It's
for this important reason the Trane Home Comfort Institute
recommends that if you're replacing your furnace, you ask your
heating contractor whether your current chimney or flue pipe
is adequate for the new equipment. If not, new venting will be
required.
Here
are some other facts about venting that the experts say you
should know:
If
a new gas furnace is installed as replacement, it is usually
placed in the same location as the old furnace. Most building
codes require that a furnace be installed as close as possible
to the chimney, and that the length of the vent pipe between
the furnace and the chimney be as short as possible. This
ensures that the flue gases will remain hot enough to maintain
a gaseous state throughout their journey to the outside.
Furnaces
with efficiency or AFUE ratings of 78 and 80 percent generate
gases at temperatures up to 500°F, which is hot enough for
them to be buoyant and to permit natural draft venting. If
combustion products should cool enough to condense before
leaving the chimney, water vapor could corrode the venting
system.
Condensing
gas furnaces, which have efficiency ratings of 90 percent and
higher, reduce the temperature of the flue gases to as low as
100°F, permitting venting through plastic pipe in a side wall
similar to a gas dryer or through the roof. This feature
provides much more flexibility in the placement of the
furnace.
Finally,
if you're replacing an oil furnace with a new gas furnace that
will use an existing chimney for venting, you should have the
vent pipe and chimney cleaned and checked for proper sizing
before you begin operation of the new unit. This is
recommended because many of the new higher efficiency gas
furnaces use smaller vents.
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Call
(704) 598-2677 today ...
to
have one of our professional technicians show you how we can
lower your utility bills and improve the comfort of your home!
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