The intake was just stubbed off the unit in the attic.
Furnace vent pipe through roof.
The only thing terminated through the roof was the exhaust.
That s because the combustion byproducts are in a gaseous form so the gases can float up through the flue pipe and out of your roof.
Ok the new efficient furnace requires a pvc vent pipe and the older furnace required a metal type b vent.
The outer pipe draws air for combustion from outside and the smaller pipe occupies the inner position and is used to vent the exhaust fumes.
Match the vent pipe to the furnace maker s recommendations either sheet metal or vinyl.
1 avoid an excessive number of turns and bends figure 5 and 2 maximize rise.
Run the vent pipe up through the roof and install a metal or pvc flashing collar over it.
If your furnace has an afue rating below 90 percent it will most likely have a flue pipe that goes up through your roof.
Push the male end of a new vent pipe up through the bottom of the roof flashing and set its female end on the male end of the vent pipe that connects to the gas furnace.
They must run a new pipe or pipes to the exterior of the home and i would also agree that running through basement ceiling would be much easier than trying to route it up through the house.
On the roof you don t want to turn the exhaust vent down because if the chance of recirculating flue gas back into the combustion air intake.
High efficiency furnaces take advantage of the heat in the combustion gases that are wasted in natural ventilation systems.
If your furnace has an afue rating of 90 or lower it probably exhausts the gases though the flue pipe on your roof.
Plumbing vent pipes are connected to your drain system and are needed for water to drain properly.
First consider the ambient temperature of the air around the vent pipe.
When water drains air must replace the space that was taken up by the water.
The older vent can not be used for the new furnace.
If your furnace has an afue rating of 90 percent or above it will have a flue pipe that.
Piping can be set horizontally to allow venting through a sidewall or vertical installation can also be undertaken to allow venting through the roof.
Another problem is that flue pipes that go through the roof tend to be less efficient.
The vents consist of circular or oblong pipe that attaches to a flange on the furnace and extends upward through an attic and passes through a roof flashing.
Ambient temperature two ambients must be considered.
Running a vent pipe out of the roof takes some careful preparation.
The exhaust flue was 2 pipe with two elbows and about 6 in length.
Vent pipes provide this air by running outside the structure of the house.
