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-   -   Venting A High Efficency Furnace (http://www.diychatroom.com/f17/venting-high-efficency-furnace-5593/)

SnoBird 12-28-2006 08:41 PM

Venting A High Efficency Furnace
 
HELLO -- I want to install a new high efficency furnace in my ground floor condo (crawlspace below) Can the flue (exaust) pipe --vynil--pcv--or whatever you call it--be routed down about 4 ft to the crawlspace and then horizontaly about 12 ft to the outside? All of these I have seen have a blower in the exhaust system. I don't have access to the condo above.

Thanks for any help

SnoBird

redline 12-29-2006 05:12 AM

There is a limit on how many bends (angles) and the length of the pipe. You would need to check with the manufacturer of the model that you may want to purchase.

Usually 3 right angles is the limit.

acefurnacefixer 12-29-2006 07:05 AM

NO! vent pipe of any make up can never go DOWN............

trollmastergeneral 12-29-2006 06:13 PM

furnaces vented with pvc have to be sloped back to the unit because the exhaust is so humid it will condensate. the condensate has to run back to the furnace and out to a drain.there is a 80% furnace that can vent down to exhaust but this wont help you in your home.:whistling2:

acefurnacefixer 12-30-2006 08:59 AM

Quote:

Originally Posted by trollmastergeneral (Post 28149)
furnaces vented with pvc have to be sloped back to the unit because the exhaust is so humid it will condensate. the condensate has to run back to the furnace and out to a drain.there is a 80% furnace that can vent down to exhaust but this wont help you in your home.:whistling2:


???????????????????? What one? please enlighten me.

trollmastergeneral 12-30-2006 10:00 AM

adp unit heaters specify that the exhaust be sloped down so any condesate runs out the exhaust.I believe that adp and reznor are made by same manufacture.You may be able to find that in reznor instruction manuals also.this is only on the power vent models. These units can be exhausted up but you must install a tee and a drain.

acefurnacefixer 12-30-2006 01:07 PM

What happens to the HOT flue gasses that cant travel down, because the laws of physics tell us that hot air rises.?

trollmastergeneral 12-30-2006 01:36 PM

please note I did mention this is on a power vent model.ace do you disagree with this.I would be more than happy to post the adp instruction manuel on line for you.please correct me if I am wrong.I always want to give out correct information to help people.

acefurnacefixer 12-30-2006 03:34 PM

I am not making a attempt to discount your statement. I would love to see the instalation instructions though. I have never seen a manufacture that pourposely dumped acidic condensate out of a downward slopped vent pipe.

trollmastergeneral 12-30-2006 05:41 PM

well ace no problem.being a holiday weekend I cant get it till next week.but Idefinetly will do that for you.

acefurnacefixer 12-30-2006 08:00 PM

Is the www. shut down due to a holiday?

gregzoll 12-31-2006 09:17 PM

Personally, I do not see no reason as to not being able to run the venting down, then across the joists to an outside spot. I would just check with the HVAC contractor to make sure that the unit can allow for the venting to happen downwards, due to most you see have the vent pipes running up & then out the side to a outdoor point.


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