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Old 03-03-2010, 09:37 PM   #1
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Old 03-03-2010, 10:22 PM   #2
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Termination must be a min 2' above anything within 10' of it horizontally. And comply with manufacturers min height requirements.

International Fuel Gas Code has the section your looking for.
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Old 03-04-2010, 12:13 AM   #3
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Old 03-04-2010, 01:17 AM   #4
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High efficiency gas furnaces have different venting needs than the old classical gas furnace that required double wall chimney. The high effeciency furnances use PVC pipe for venting, and you need not only a vent out, but a dedicated freash air source (i.e. two pvc pipes). Many of these furnances can vent through a wall. There's certain requirements like it has to be at least 12" off the ground and you can't vent under a deck (you wouldn't want to as the exhaust gas is warm and moist).
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Old 03-04-2010, 01:39 AM   #5
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Old 03-04-2010, 02:43 AM   #6
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Ok. Does the furnace gets it combustion air from outside. Or does it use combustion air from the house.

If from the house, its a mechanical vent system.
If from outside its a direct vent system.
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Old 03-04-2010, 02:28 PM   #7
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Old 03-04-2010, 02:57 PM   #8
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Quote:
Originally Posted by Klawman View Post
I don't know, but I only believe there is one pvc pipe and it is on the roof. It has a downfacing "u" at the top and the manual has a figure labeling what looks like it an intake. The City has now chimed in and it says the minimum is 3" if the unit is in the attic, which it is.
AHJ/Authority Having Jurisdiction.

can add additional requirements to any national or international code.
So if the city is saying 3'. Then they probably have a printed version of their code. that you can get a copy of, and show to the HOA. They can not legally force you to violate an International, or local building/safety code.

Although a down facing U is for an intake. Nothing says it isn't the flue pipe, and terminated wrong.

Might want to recheck the piping.
And post a pic of the furnace and its PVC piping.
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Old 03-04-2010, 03:08 PM   #9
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Old 03-04-2010, 03:13 PM   #10
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Quote:
Originally Posted by Klawman View Post
Got better info. It is an exhaust vent and the unit isn't in the attic. Downturn U wasn't required. I was thinking that he had a larger unit. Sorry. 3' only applies to attic installs. While 12" is the minimum, it depends on pitch of roof. Believe roof is steeper than average. Have forwarded pictures to the city so that it can try to determine pitch.
Direct vent has a different requirement then mechanical or natural.
However. if it doesn't have an intake pipe, it is not a direct vent system.
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Old 03-04-2010, 03:13 PM   #11
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if you have access to attic take a 2' level and mark top edge at 1'. hold end of level against bottom of rafter/truss cord and measure up at 1' mark that will give you rise/pitch
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Old 03-05-2010, 04:03 PM   #12
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Old 03-05-2010, 05:16 PM   #13
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OMG, I now understand what my HVAC installer was saying.

Rather than having PVC pipes sticking out of the building, my HVAC contractor installed this for a terminater:
http://www.garagejournal.com/forum/s...ad.php?t=15066

At first I though this thing hanging on the side of my house (over the garage door) was ugly. But now I see compared to the alternative, it's a thing of beauty.
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Old 03-05-2010, 05:27 PM   #14
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looks like a 10/12 pitch, maybe 8
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Old 03-05-2010, 05:40 PM   #15
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