Furnace Vent Pipe Through 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.

Furnace vent pipe through roof.

If your furnace has an afue rating of 90 percent or above it will have a flue pipe that. 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. 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. The older vent can not be used for the new furnace.

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. 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 intake was just stubbed off the unit in the attic. Vent pipes provide this air by running outside the structure of the house. If your furnace has an afue rating of 90 or lower it probably exhausts the gases though the flue pipe on your roof. High efficiency furnaces take advantage of the heat in the combustion gases that are wasted in natural ventilation systems.

Another problem is that flue pipes that go through the roof tend to be less efficient. Plumbing vent pipes are connected to your drain system and are needed for water to drain properly. As stated earlier heat loss through the vent pipe walls can take away from the draft force. The exhaust flue was 2 pipe with two elbows and about 6 in length.

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. 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. Match the vent pipe to the furnace maker s recommendations either sheet metal or vinyl. 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 only thing terminated through the roof was the exhaust. Ok the new efficient furnace requires a pvc vent pipe and the older furnace required a metal type b vent. 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. Old furnace vents are removed when.

First consider the ambient temperature of the air around the vent pipe.