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.

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. On the other hand the higher the efficiency of a furnace the lower the flue gas temperature. It is classified as type bh venting.

Moving forward section 406 includes requirements for inspection testing and purging of piping systems. One pipe brings combustion air directly into the furnace and mixes it with fuel. High efficiency furnaces come with two pipes. Well making sure that you choose the right venting style will protect them.

When installed correctly this venting arrangement works with an 80 gas furnace or lower than 80 gas water heater. The different types of 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. And venting of gas fired appliances and equipment.

Be dependent on the existing furnace system for venting. Other aspects of high efficiency furnace venting. This practice is common with standard efficiency 80 furnaces. There are several other important aspects of high efficiency furnace venting.

Furthermore chapter 4 concludes with several other code. Indoor air requirements 80000 furnace and 40000 water heater 120 x 50 6000 ft3 800 ft2 7 ft ceiling 20. Two cases which can cause poor venting are the oversizing of the vent or reducing the. Section 407 in chapter 4 of the fuel gas code lists requirements for piping support.

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. Due to the condensing nature of a high efficiency furnace its venting must be made of a material that is resistant to corrosion. Both of these pipes are directed to the outdoors at about 95 of the furnaces that i inspect in minnesota.

The other pipe exhausts the combustion gases directly to the outdoors. The photo below shows typical combined furnace water heater venting. With a replacement high efficiency furnace the existing vent pipe does not work for. Better business robert parkhurst march 3 2017.

Venting gas appliances nfpa 54 code better buildings. The pvc pipes are used for air intake exhaust gas and to remove the corrosive condensation resulting from the combustion process. Refer to your local building code the gas safety regulation under the. Higher btuh furnaces produce higher flue gas temperatures.

This high efficiency venting system must be installed when you install the new furnace.