High Efficiency Gas Furnace Venting Code Requirements

Section 408 and 409 deal with drips and sloped piping and shutoff valves respectively.

High efficiency gas furnace venting code requirements.

This high efficiency venting system must be installed when you install the new furnace. 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. Installation guide for existing houses. Of the vent plus the furnace input and efficiency are factors affecting the temperature of the flue gases.

Better business robert parkhurst march 3 2017. Two cases which can cause poor venting are the oversizing of the vent or reducing the. These can include hot water tanks and other equipment related to the home. Well making sure that you choose the right venting style will protect them.

Venting for high efficiency gas furnaces materials. Be dependent on the existing furnace system for venting. With a replacement high efficiency furnace the existing vent pipe does not work for. High efficiency furnaces come with two pipes.

Refer to your local building code the gas safety regulation under the. This practice is common with standard efficiency 80 furnaces. On the other hand the higher the efficiency of a furnace the lower the flue gas temperature. The pvc pipes are used for air intake exhaust gas and to remove the corrosive condensation resulting from the combustion process.

And venting of gas fired appliances and equipment. In a great majority of cases plastic piping is used to vent high efficiency equipment. Upgrading the heating and cooling system to higher efficiency equipment. The photo below shows typical combined furnace water heater venting.

Section 407 in chapter 4 of the fuel gas code lists requirements for piping support. Venting gas appliances nfpa 54 code better buildings. Other aspects of high efficiency furnace venting. Indoor air requirements 80000 furnace and 40000 water heater 120 x 50 6000 ft3 800 ft2 7 ft ceiling 20.

Due to the condensing nature of a high efficiency furnace its venting must be made of a material that is resistant to corrosion. Higher btuh furnaces produce higher flue gas temperatures. The different types of venting. There are several other important aspects of high efficiency furnace venting.

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. When installed correctly this venting arrangement works with an 80 gas furnace or lower than 80 gas water heater. It is classified as type bh venting.

Moving forward section 406 includes requirements for inspection testing and purging of piping systems.