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Old 10-19-2008, 09:42 PM   #1
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venting a high efficiency furnace through the roof (how high)


Hello all.

I a trying to reroute the venting that was done for a high efficiency furnace (~3yrs ago). The venting was run to the side of our house (& there may someday be an addition @ this location). I am therefore attempting to vent straight up & through the roof.

Can anyone tell me how high above the roof the fresh air & exhaust pvc needs to be?

Thanks in advance.

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Old 10-19-2008, 11:06 PM   #2
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venting a high efficiency furnace through the roof (how high)


12 inches above average snow fall

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Old 10-19-2008, 11:33 PM   #3
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venting a high efficiency furnace through the roof (how high)


Gotta know what model you have. But assueming a ranch style home I would terminate them both at least 18" above roof line and 18" apart.

Your furnace literature should have an installation manual where you will find venting instructions for vertical venting conditions.
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Old 10-20-2008, 11:04 AM   #4
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venting a high efficiency furnace through the roof (how high)


Code here is 12 inches from the roof in any direction 2 feet from any opening window (in this case skylights).
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Old 10-20-2008, 12:34 PM   #5
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venting a high efficiency furnace through the roof (how high)


Marvin, I think he means the tables for vertical venting. He might have tighter reestrictions on going straight up than other brands. So those tables are gonna be mandatory to know what the max length and number of elbows can be used.
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Old 10-20-2008, 03:10 PM   #6
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Marvin, I think he means the tables for vertical venting. He might have tighter reestrictions on going straight up than other brands. So those tables are gonna be mandatory to know what the max length and number of elbows can be used.
Ohhhh. Another senior moment.

Yea, 20 90's with 2 inch pipe is not allowed. Kind of like that?
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Old 10-20-2008, 08:25 PM   #7
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venting a high efficiency furnace through the roof (how high)


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Ohhhh. Another senior moment.

Yea, 20 90's with 2 inch pipe is not allowed. Kind of like that?

LOL...Wake up Marv....at this rate you are gonna make me look as smart as Beenthere.


BTW hows the family?
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Old 10-20-2008, 08:54 PM   #8
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venting a high efficiency furnace through the roof (how high)


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LOL...Wake up Marv....at this rate you are gonna make me look as smart as Beenthere.


BTW hows the family?
Doing good. Finished up the side door hall way today and my wife is very happy.

The mud guy did such a good job I gave him the afternoon off with pay and a six pack of beer.

Oh wait, I'm the mud guy. Who'd I give my beer too?
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Old 10-20-2008, 09:04 PM   #9
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venting a high efficiency furnace through the roof (how high)


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Doing good. Finished up the side door hall way today and my wife is very happy.

The mud guy did such a good job I gave him the afternoon off with pay and a six pack of beer.

Oh wait, I'm the mud guy. Who'd I give my beer too?

UUHHHH.. don't look now but I think the dog is staggering...
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Old 10-20-2008, 10:14 PM   #10
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venting a high efficiency furnace through the roof (how high)


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UUHHHH.. don't look now but I think the dog is staggering...
Oh great, and the neighbors just bought the cat back who was passed out in their front yard.
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Old 10-20-2008, 11:19 PM   #11
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venting a high efficiency furnace through the roof (how high)


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Oh great, and the neighbors just bought the cat back who was passed out in their front yard.

Man! I'm I'm moving to Portland. Even the house pets are getting stoned!
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Old 10-21-2008, 01:48 PM   #12
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venting a high efficiency furnace through the roof (how high)


Go to the I&O manual and it will give you all the information you need. It will have the distances above roof and also total equivelent feet allowed to use. They should also give the TEF for elbows etc. They rule when venting their product.

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