When we are talking about gas furnace vent pipe code we need to talk about the different types of the vents first after all you want to keep your family safe from harm.
High efficiency gas furnace venting code requirements.
Furthermore chapter 4 concludes with several other code.
And venting of gas fired appliances and equipment.
In a great majority of cases plastic piping is used to vent high efficiency equipment.
Venting gas appliances nfpa 54 code better buildings.
Well making sure that you choose the right venting style will protect them.
The pvc pipes are used for air intake exhaust gas and to remove the corrosive condensation resulting from the combustion process.
When installed correctly this venting arrangement works with an 80 gas furnace or lower than 80 gas water heater.
Section 407 in chapter 4 of the fuel gas code lists requirements for piping support.
This practice is common with standard efficiency 80 furnaces.
Both of these pipes are directed to the outdoors at about 95 of the furnaces that i inspect in minnesota.
Other aspects of high efficiency furnace venting.
The photo below shows typical combined furnace water heater venting.
The different types of venting.
With a replacement high efficiency furnace the existing vent pipe does not work for.
Indoor air requirements 80000 furnace and 40000 water heater 120 x 50 6000 ft3 800 ft2 7 ft ceiling 20.
High efficiency furnaces come with two pipes.
Installation guide for existing houses.
On the other hand the higher the efficiency of a furnace the lower the flue gas temperature.
Be dependent on the existing furnace system for venting.
Moving forward section 406 includes requirements for inspection testing and purging of piping systems.
Higher btuh furnaces produce higher flue gas temperatures.
Due to the condensing nature of a high efficiency furnace its venting must be made of a material that is resistant to corrosion.
One pipe brings combustion air directly into the furnace and mixes it with fuel.
Section 408 and 409 deal with drips and sloped piping and shutoff valves respectively.
For homes with gas fired warm air furnaces this could mean replacing an existing 70 to 80 annual fuel utilization efficiency afue furnace with a high efficiency furnace in the 90 to 98 afue range.
Better business robert parkhurst march 3 2017.
Of the vent plus the furnace input and efficiency are factors affecting the temperature of the flue gases.
These can include hot water tanks and other equipment related to the home.
Upgrading the heating and cooling system to higher efficiency equipment.
Two cases which can cause poor venting are the oversizing of the vent or reducing the.
There are several other important aspects of high efficiency furnace venting.
Refer to your local building code the gas safety regulation under the.
It is classified as type bh venting.
