Gas Furnace Flue Pipe Code

Fundamentals of gas appliance venting and ventilation 1985 american gas.

Gas furnace flue pipe code.

Flue pipe is too small for the amount of combustion gases generated by the furnace. Well making sure that you choose the right venting style will protect them. A gas wall heater or older forced air furnace generally requires a type b double wall metal vent pipe while a new high efficiency furnace requires a schedule 40 pvc vent pipe. Cloth duct tape is not permitted to be installed on fuel burning appliance vent pipes.

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. Also consult local and state codes for proper chimney sizing and application or in the absence of local and state codes the national fuel gas code ansi z223 1 nfpa 54 current edition. This vent pipe is connected to the shared vent stack with the furnace. Metal flue fire clearance requirements single wall metal pipe flues gas fired equipment.

Termination of flue vent connector at an existing chimney. The most common variables for which the flue must be sized are btu capacity of the furnace the horizontal and vertical length of the flue and the number of elbows and type of vent connector the part of the flue that connects the furnace to the main flue pipe. See also condensing boilers furnaces. Many municipalities do not allow metal foil tape either.

Traditional gas fired forced air furnaces produce hot combustion exhaust gasses and therefore need metal vent pipes or chimneys. Fire clearances required range from 6 to 36 depending on the equipment. Intake and exhaust pipes pvc allowed 140 f limit furnace water heater boiler manual size of pipe and allowable lengths support terminations through wall or through roof 12 above grade or anticipated snow level in same pressure location concentric venting kit 25. 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.

Masonry flue or shared flue venting. Where the system is routed to the outdoors through an existing masonry chimney containing flue products from another gas appliance or where required by local codes then 3 venting of type 29 4c stainless steel must be used in place of pvc material. There is a disconnection at the elbow. Type b vent pipe.

The different types of venting.