I had a new high effeciency (95%) installed and want to make sure it's vented OK. The vent goes out the back of the house and extends about 6 feet beyond the wall and ends under the middle of ther deck. The pipe is pretty much level.
Should the pipe slope down going out or up? Meaning should the moisture drain outside or back to the furnace? Is there any problem with the vent under the deck? At least there won't be any snow build up around the vent.
2006-10-21 04:14:03 · 5 answers · asked by Skip A 2 in Home & Garden ➔ Maintenance & Repairs
Normally the pipe is pitched so that moisture will run back to the furnace. It is not advisable to put more than a foot of PVC vent pipe beyond the wall because you may run into freezing problems. Also you cannot end the vent under a deck. Extend it out beyond the end of the deck about a foot. But you must also insulate the PVC pipe with 1" thick insulation. You must not have had the job inspected by the local mechanical inspector because an install such as you have specified would not pass code. Good luck.
2006-10-21 08:57:35 · answer #1 · answered by Huero 5 · 1⤊ 0⤋
installation instruction on most high90 plus furnaces use the low stack temperatures to help get the high efficiency up so high.
they have 2 heat exchangers and and you slope 1/4 inch per foot TOWARDS THE FURNACE. the installation instructions will tell you hhow far out the wall you can go.. under a deck you MUST INSULATE THE PIPE SO IT DOESNT FREEZE.
call the gas safety branch in your local area and get it inspected.
good luck
2006-10-21 15:02:48 · answer #2 · answered by flashmp1 3 · 2⤊ 0⤋
A condensing type of furnace extracts so much heat from the exhaust gases that it reduces the temperature of the gas to the point where water vapor turns to liquid and acids (eg sulphuric and nitric) form in the condensate. A stainless steel flue will corrode or a masonry flue will become pitted, allowing holes to form and exhaust gas to leak into your house. A PVC flue will not corrode or pit. You also need a separate condensate drain line, typically 1" or 3/4" PVC sprinkler pipe to allow the acidic water to drain into the ground. Some building codes require a dry sump for the condensate. A dry sump is a 24"x24"x18" deep hole filled with rocks and gravel, then covered with about 4" of dirt.
2016-05-22 07:35:37 · answer #3 · answered by Anonymous · 0⤊ 0⤋
the vent should go down away from the furnace to drain the water away from it also the furnace should have a drain on it too to get rid of moisture from the burner or else it will rot it over time
2006-10-21 06:09:17 · answer #4 · answered by Anonymous · 0⤊ 3⤋
THOSE REALLY HIGH EFF. MODELS USE PVC TO VENT OUT, IF THAT'S THE CASE, YOU SHOULD BE OK. IT SHOULD TILT DOWN SO NO WATER WILL RUN BACK TO FURNACE!
2006-10-21 04:44:47 · answer #5 · answered by Bonno 6 · 1⤊ 2⤋