Gas Furnace Flue Pipe Installation

The good things about this pipe is that it is cheap and easy to install.

Gas furnace flue pipe installation.

Without it smoke and other toxic materials will build up inside the house. The bad things are it can burn you because of its high temperature and it must be at least 6 from combustibles. Installing a flue pipe is the most important part of the installation of your new furnace. Cut the galvanized pipe as necessary with your aviation snips if you need a length shorter than the standard lengths.

These pvc pipes are connected to the furnace and expelled outside. There are two types of venting associated with those furnaces single pipe and two pipe systems. It draws air from within the house for combustion. Type b vents are a standard design that most modern gas furnaces use.

Install the flue pipe to the chimney connection starting at the furnace. You will need to have an existing fireplace chimney to accomplish the installation. The astm d1785 standard for schedule 40 applying to plumbing drain piping states this standard specification for pvc pipe does not include requirements for pipe and fittings intended to be used to vent combustion gases. The 2 pipe leaves the furnace and connects to the 3 pipe at the first turn.

These toxins can have a deadly effect. 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. I began the installation of the new vent flue by purchasing schedule 40 pvc pipe in 2 and 3 diameters. This pipe is generally used to connect the furnace to the vent or chimney but not as the vent itself as it cannot be used in an unconditioned space.

The air is then vented outside through a b vent pipe which is set vertically to expel combustion air through the roof. The flue pipe is connected together by inserting the crimped end of each pipe into the non crimped end of each pipe. This high efficiency venting system must be installed when you install the new furnace. Natural vent pipes can be installed fairly easily and costs are fairly modest making them a popular choice.

If you do not you will need to also install a vent pipe similar to the one you have for the bathroom. You don t have to worry about any toxic gas or combustion byproduct that will linger inside the house if you have the flue. When upgrading to or having a high efficiency furnace installed exhaust gases will be discharged through the pvc pipe and not the chimney flue. Even when a furnace manufacturer does reference a standards agency and standard such as astm d1785 for schedule 40 pvc pipe the standard is only for installation of the pipe.

Condensate accumulates in the vent pipe dissolves flue gas deposits and ultimately leaks both outside and back into the equipment. Gases produced during combustion are very hot and as such easily rise through the flue. Each joint is screwed together with at least four sheet metal screws. Gas furnace installation manual publication 94 24161 124 06 provided by the reader b l.

Other aspects of high efficiency furnace venting.