Intakes should not be located directly above any wall exhaust or vent.
High efficiency furnace intake and exhaust.
This high efficiency venting system must be installed when you install the new furnace.
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There are several other important aspects of high efficiency furnace venting.
A conventional furnace vents these combustion gases through a vertical exhaust system that is attached to the furnace.
High efficiency furnaces come with two pipes.
Since high efficiency furnaces draw air directly from outside the furnace itself does not require a fresh air intake in order to replace inside air that otherwise would have been drawn from the room the furnace is located in.
Other aspects of high efficiency furnace venting.
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Irc 2006 section m1602 2.
Both of these pipes are directed to the outdoors at about 95 of the furnaces that i inspect in minnesota.
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.
Refer to the furnace installation instructions for intake vent pipe sizing information.
This is an alternative to the standard two pipe intake vent shown in the basic furnace installation instructions.
One pipe brings combustion air directly into the furnace and mixes it with fuel.
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.
Warning do not use the concentric vent kit for anything other than a category iv furnace.
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.
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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.
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.
Cvent 3 is for use with 3 in.
