There are several other important aspects of high efficiency furnace venting.
High efficiency furnace intake and exhaust.
This is an alternative to the standard two pipe intake vent shown in the basic furnace installation instructions.
A conventional furnace vents these combustion gases through a vertical exhaust system that is attached to the furnace.
Refer to the furnace installation instructions for intake vent pipe sizing information.
Intakes should not be located directly above any wall exhaust or vent.
Other aspects of high efficiency furnace venting.
If not installed correctly or checked regularly problems in these pipes can affect the operation of the furnace itself.
High efficiency or condensing furnaces exhaust the combustion gases and bring in fresh air through pvc pipes to the outside usually routed through the sidewall of the house.
Cvent 3 is for use with 3 in.
One pipe brings combustion air directly into the furnace and mixes it with fuel.
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The pvc pipes are used for air intake exhaust gas and to remove the corrosive condensation resulting from the combustion process.
The other pipe exhausts the combustion gases directly to the outdoors.
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Due to high efficiency furnaceshaving their own fresh air intake no air is drawn from inside your home.
High efficiency furnaces come with two pipes.
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Intake and exhaust vents for high efficiency furnaces must be high enough off of the ground to avoid any restrictions or being too close to snow that may melt and form an ice blockage.
Irc 2006 section m1602 2.
Warning do not use the concentric vent kit for anything other than a category iv furnace.
A high efficiency furnace uses a different type of venting system because it extracts the heat that remains in those combustion gases before venting the resultant mixture of water and carbon dioxide.
Because intake vents pull in outdoor air an inadequate intake vent height may also allow the vent to pull in snow where it then melts and freezes.
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Wall intakes must also be 10 feet from any exhaust fan discharge outlet unless that outlet is 3 feet or more above the intake location.