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