Another problem is that flue pipes that go through the roof tend to be less efficient.
Furnace vent pipe through roof.
Old furnace vents are removed when.
Run the vent pipe up through the roof and install a metal or pvc flashing collar over it.
Plumbing vent pipes are connected to your drain system and are needed for water to drain properly.
High efficiency furnaces take advantage of the heat in the combustion gases that are wasted in natural ventilation systems.
Ok the new efficient furnace requires a pvc vent pipe and the older furnace required a metal type b vent.
If your furnace has an afue rating of 90 percent or above it will have a flue pipe that.
First consider the ambient temperature of the air around the vent pipe.
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.
When water drains air must replace the space that was taken up by the water.
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.
1 avoid an excessive number of turns and bends figure 5 and 2 maximize rise.
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.
Ambient temperature two ambients must be considered.
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.
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.
Twist the roof s vent pipe clockwise one half turn with one hand while holding the gas furnace s vent pipe still with the other hand.
If your furnace has an afue rating below 90 percent it will most likely have a flue pipe that goes up through your roof.
The older vent can not be used for the new furnace.
As stated earlier heat loss through the vent pipe walls can take away from the draft force.
Running a vent pipe out of the roof takes some careful preparation.
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.
Piping can be set horizontally to allow venting through a sidewall or vertical installation can also be undertaken to allow venting through the roof.
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.
Match the vent pipe to the furnace maker s recommendations either sheet metal or vinyl.
