Other aspects of high efficiency furnace venting.
High efficiency furnace intake and exhaust.
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.
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.
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.
A conventional furnace vents these combustion gases through a vertical exhaust system that is attached to the 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.
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If not installed correctly or checked regularly problems in these pipes can affect the operation of the furnace itself.
High efficiency furnaces come with two pipes.
Warning do not use the concentric vent kit for anything other than a category iv furnace.
One pipe brings combustion air directly into the furnace and mixes it with fuel.
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Both of these pipes are directed to the outdoors at about 95 of the furnaces that i inspect in minnesota.
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Due to high efficiency furnaceshaving their own fresh air intake no air is drawn from inside your home.
The other pipe exhausts the combustion gases directly to the outdoors.
Irc 2006 section m1602 2.
This high efficiency venting system must be installed when you install the new furnace.
There are several other important aspects of high efficiency furnace venting.
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.
This is an alternative to the standard two pipe intake vent shown in the basic furnace installation instructions.
Intakes should not be located directly above any wall exhaust or vent.
Refer to the furnace installation instructions for intake vent pipe sizing information.
