Furnace Exhaust Pipe Temperature

Sidewall venting when your new high efficiency condensing furnace is installed your contractor should take extra precautions to make sure all ventilation systems are properly placed and working correctly.

Furnace exhaust pipe temperature.

Gas fired heating appliance no draft hood. This is another affordable option for the heating solution. Since the exhaust pipe is running on a sidewall the fan works together with the furnace. With a conventional gas furnace you should be at about 140 f 170 f at the supply plenum.

The temperature in the flue pipe of your furnace can run as high as 400 degrees celsius which is about 750 degrees fahrenheit. Also known as the induced draft fan this one has a fan that is located on the end of the pipe. However the temperature at the outlet of the furnace is dependent on the temperature of the incoming air. A high efficiency furnace will be lower around 110 f 140 f.

Natural gas fired heating appliance with draft hood. These different plastics have different maximum heat service temperatures. It will draw in air for the combustion and then expel the fume outside. Liquefied petroleum gas fired heating appliance with draft hood.

The only thing you may have to additionally invest in is a drain line to drain the acidic water that is a result from the condensation from the exhaust. Exhaust temperature o f o c chemical oxidation. This temperature is an indication that your furnace is not running at maximum efficiency and you are losing heat up the chimney. Some building inspectors discourage taping up furnace clothes dryer and water heater flue joints so check your local building codes before using this tape especially when selling your home.

When this temperature starts to exceed 130 degree f it is usually an indication that there is a problem. To make it simple the typical combustion gas temperature for a 90 efficient furnace should be in the 100 to 130 degree f range. These highly efficient furnaces have a heat exchanger and a condensing chamber that help maintain a considerably low temperature on the pipes. Heat will seal the tape to the metal pipe as the temperature climbs.

When applied to a cooled down pipe. I don 39 t know what temperature your furnace flue pipe should run but an 80 efficiency furnace is not very efficient so i would expect that the flue pipe would run quite hot. Pvc has the lowest rating at 140 degrees fahrenheit cpvc has the highest at 194 degrees and abs falls in between at a maximum service temperature of 160 degrees. The low temperature residual flue gases vent outside through special plastic pipes.