Gas Furnace Venting Code

Higher btuh furnaces produce higher flue gas temperatures.

Gas furnace venting code. The different types of venting. Colour illustration of direct vent sidewall terminal clearance distances adapted from american standard furnace installation instructions that in turn cites ansi z223 1 nfpa 54 national fuel gas code for us installations and cites csa b149 1 natural gas and propane installation code for canadian direct vent gas vent installations. 80000 furnace and 40000 water heater 120 x 50 6000 ft3 800 ft2 7 ft ceiling 20. 5 air intakes shall be clearly labelled as such for identification from locations outside the dwelling unit.

Well making sure that you choose the right venting style will protect them. This includes combining venting systems for several appliances utilizing a common vent. And venting of gas fired appliances and equipment. 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. Refer to b149 1 natural gas and propane installation code bc building code and the bc safety authority4 for further information on health and safety regulations related to furnace installations. Basic information and an illustration of proper exit terminals for gas venting systems. A conventional natural gas furnace will vent the dangerous combustion gases through a simple vertical exhaust system that is attached to the furnace.

In contrast modern high efficiency condensing furnaces exhaust much cooler gasses and need only plastic pipe materials such as pvc cpvc or abs for their exhaust vents some high efficiency furnaces also include a plastic pipe for intake area and all types. The exhaust system typically uses metal venting often routed into a chimney stack to exhaust the combustion gases created in the furnace fire chamber. Traditional gas fired forced air furnaces produce hot combustion exhaust gasses and therefore need metal vent pipes or chimneys. 4 the distance separating air intakes from buildingenvelope penetrations that are potential sources of contaminants such as gas vents or oil fill pipes shall be not less than 900 mm.

The vent system for a gas fired water heater must be installed according to local and state codes or in the absence of local or state codes the current edition of the national fuel gas code ansi z223 1 nfpa 54 link to 2012 edition. Two cases which can cause poor venting are the oversizing of the vent or reducing the. Worksafe bc regulated issues such as asbestos abatement can prevent a furnace installation from occurring if not mitigated beforehand and should also be. International fuel gas code overview exit terminals of mechanical draft and direct draft systems appendix c.