Venting High Efficiency Furnace Through Chimney

Should my furnace flue pipe go through the roof or the side of the house.

Venting high efficiency furnace through chimney.

The efficiency rating of a furnace is called afue annual fuel utilization efficiency. A high efficiency furnace uses a different type of venting system because it extracts the heat that remains in those combustion gases before venting the resultant mixture of water and carbon dioxide. These high efficiency units use pvc pipe to pull air in for combustion and vent the by products to the outdoors. High efficiency furnace venting thru chimney pvc sch.

Your furnace won t exhaust gases into your chimney anymore. The condition of the chimney is a factor because new super efficient gas furnaces do not vent up the chimney they are vented outdoors horizontally through a wall by a small plastic pipe. You cannot remove if chimney being used by furnace unless you get a high efficiency furnace. This structure generally uses the furnace vent pipe through roofbecause the b venting pipe is designed in vertical manner.

Click to read further detail. 2 the structure of the brickwork does it span more than 1 level. A conventional furnace vents these combustion gases through a vertical exhaust system that is attached to the furnace. In the first stage gas is burned to heat the first heat exchanger.

Furthermore can a high efficiency furnace vent through a chimney. When the vent is withdrawing air from the house it expels the gas outside through the vent. For these reasons exhaust from a condensing furnace should never be vented through a standard chimney. In contrast modern high efficiency condensing furnaces exhaust much cooler gasses and need only plastic pipe materials such as pvc cpvc or abs for their exhaust vents some high efficiency furnaces also include a plastic pipe for intake area and all types.

So which type of venting system should your furnace have. 1 is the chimney being used to vent a furnace or does the house have a direct vent furnace vent out an exterior wall. If your furnace has an afue rating below 90 percent it will most likely have a flue pipe that goes up through your roof. In fact most mfrs.

Also known as the type b this vent is operating on the natural air convection. Conventional furnaces use only one they use a two stage process. This fix often makes sense if you ve got a really old furnace or a big external chimney that stays cold throughout the winter. That depends on whether you have a standard efficiency or a high efficiency furnace.

40 pipe is not approved as a venting material for cat iii or iv by the pipe mfrs. In comparing the venting of exhaust gases from a high efficiency furnace boiler or water heater with the venting of exhaust gases from a conventional heating system it will be immediately obvious that the high efficiency equipment exhaust is produced at a low enough temperature that it is vented through comparably small diameter plastic piping. Nor as a chimney liner.