They produce condensing flue gases, and their vent connector pipes are plastic (positive, condensate, plastic). The installation of the furnace, wiring, warm air ducts, venting, The flue pipe runs up to a chimney in most applications, allowing exhaust gases to travel easily to the exterior of the home. The plastic vent pipes for Category IV furnaces may be specified or furnished by the manufacturer. If you have one gas appliance using a flue pipe, then single wall is sufficient. Remove the flue cap to check for blockages such as debris or birds’ nests. However, if you have two gas appliances sharing a flue pipe, then it must be double wall as seen in the image featured above. Single-wall metal pipe shall terminate at least 5 feet (1524 mm) in vertical height above the highest connected equipment draft hood outlet or flue collar. Well, the flue (which is a term referring to the vent pipe) is basically the important component from the furnace that will transport the emission from the combustion (heating) process to the outside area of the house. Many municipalities do not allow metal foil tape either. Replace and secure the cap tightly to the end of the flue pipe. Flue pipe joints should overlap 30 mm (1 1/4 in.) Compliance with all local, state, or national codes pertaining to this type of equipment should be determined prior to installation. There is a disconnection at the elbow. Compliance with all local, state, or national ... Flue pipe screen Location Requirements IMPORTANT: Do not use the furnace as a heater in a building under construction. Since the flue gas is forced into the pipe, for almost all applications the flue pipe will be under positive pressure and require Category III vent pipe. Single-wall metal pipe shall extend at least 2 feet (610 mm) above the highest point where it passes through a roof of a building and at least 2 feet (610 mm) higher than any portion of a building within a horizontal distance of 10 feet (3048 mm). Cloth duct tape is not permitted to be installed on fuel-burning appliance vent pipes. Common plastic combustion air and venting pipes are made of Schedule 40 PVC or CPVC, but the manufacturer's installation instructions will identify the required plastic pipe material. This situation is common in New York City – there are many cases where fuel oil is more affordable than gas. The code is written and agreed to by engineers. Traditional gas-fired, forced-air furnaces produce hot combustion exhaust gasses and therefore need metal vent pipes, or chimneys. Is that OK? Proper furnace / water heater venting is an extremely important issue, which depends on the performance of the house chimney / chimney flue or other exhaust assemblies. 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.

This vent pipe is connected to the shared vent stack with the furnace. Each joint in the assembly must be fastened with at least three screws. Plastic flue gas venting materials were recently added to the fuel gas codes because many high-efficiency equipment manufacturers were utilizing plastic pipe instead of stainless-steel flue pipe. 11. Good vents and flue pipes should be of the proper size and design. The conditions explained in this post also apply to the wood burning appliances. The gas vent pipe from the water heater tank is improperly sloped. See also CONDENSING BOILERS/FURNACES. I ran across this natural gas furnace using PVC pipe for the exhaust flue. Consequences of improperly assembled vent pipes, problematic chimney flue, deteriorating chimney walls can be sometimes fatal – fire and … The International Fuel Gas Code book is the basis of many installation practices, again, for safe installations.
Flue pipes are often insulated. Thanks. I’ve seen flue pipes installed upside down (some even have an UP arrow embossed on them) If it is installed incorrectly, it is a carbon monoxide gas poising hazard to the occupants, aside from also being a fire hazard as it appears to be now (assuming its an exhaust flue) Regards, Cort. 90+ GAS FURNACE INSTALLATION INSTRUCTIONS GAS FURNACE SAFETY Table of Contents ... codes in any way. They must also be properly assembled, ... tee and one 90 degree elbow we ended up with a whopping 54½ feet of TEPL or almost two and one-half times the allowed flue pipe size by code. What Vent Pipe Is Required on Top of a Furnace?. International Fuel Gas Code Overview: Codes are used by contractors and inspectors as a guideline for the safe installation of appliances and piping. Replacing a gas furnace, whether a wall or forced-air furnace, requires the appropriate venting … These appliances must comply with NFPA standards 211 and 37, and must use an exhaust pipe to get rid of flue gases. And why would you have to care about gas furnace vent pipe code?


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