High Efficiency Gas Furnace Venting Code Requirements

Of the vent plus the furnace input and efficiency are factors affecting the temperature of the flue gases.

High efficiency gas furnace venting code requirements.

On the other hand the higher the efficiency of a furnace the lower the flue gas temperature. One pipe brings combustion air directly into the furnace and mixes it with fuel. Due to the condensing nature of a high efficiency furnace its venting must be made of a material that is resistant to corrosion. With a replacement high efficiency furnace the existing vent pipe does not work for.

In a great majority of cases plastic piping is used to vent high efficiency equipment. The photo below shows typical combined furnace water heater venting. Other aspects of high efficiency furnace venting. This practice is common with standard efficiency 80 furnaces.

Venting for high efficiency gas furnaces materials. Refer to your local building code the gas safety regulation under the. Section 407 in chapter 4 of the fuel gas code lists requirements for piping support. Moving forward section 406 includes requirements for inspection testing and purging of piping systems.

The different types of venting. And venting of gas fired appliances and equipment. Section 408 and 409 deal with drips and sloped piping and shutoff valves respectively. Higher btuh furnaces produce higher flue gas temperatures.

It is classified as type bh venting. Be dependent on the existing furnace system for venting. 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 furnaces come with two pipes.

The pvc pipes are used for air intake exhaust gas and to remove the corrosive condensation resulting from the combustion process. These can include hot water tanks and other equipment related to the home. 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. There are several other important aspects of high efficiency furnace venting.

The other pipe exhausts the combustion gases directly to the outdoors. Furthermore chapter 4 concludes with several other code. Installation guide for existing houses. Indoor air requirements 80000 furnace and 40000 water heater 120 x 50 6000 ft3 800 ft2 7 ft ceiling 20.

Venting gas appliances nfpa 54 code better buildings. Both of these pipes are directed to the outdoors at about 95 of the furnaces that i inspect in minnesota. Better business robert parkhurst march 3 2017. This high efficiency venting system must be installed when you install the new furnace.

Upgrading the heating and cooling system to higher efficiency equipment.