Gas Furnace Flue Pipe Installation

Install the flue pipe to the chimney connection starting at the furnace.

Gas furnace flue pipe installation. Natural vent pipes can be installed fairly easily and costs are fairly modest making them a popular choice. The pvc pipes are used for air intake exhaust gas and to remove the corrosive condensation resulting from the combustion process. The bad things are it can burn you because of its high temperature and it must be at least 6 from combustibles. The 2 pipe leaves the furnace and connects to the 3 pipe at the first turn.

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. You will need to have an existing fireplace chimney to accomplish the installation. Gas furnace installation manual publication 94 24161 124 06 provided by the reader b l.

Other aspects of high efficiency furnace venting. Each joint is screwed together with at least four sheet metal screws. Cut the galvanized pipe as necessary with your aviation snips if you need a length shorter than the standard lengths. 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.

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. This high efficiency venting system must be installed when you install the new furnace. Installing a flue pipe is the most important part of the installation of your new furnace. You don t have to worry about any toxic gas or combustion byproduct that will linger inside the house if you have the flue.

These pvc pipes are connected to the furnace and expelled outside. The air is then vented outside through a b vent pipe which is set vertically to expel combustion air through the roof. Type b vents are a standard design that most modern gas furnaces use. Condensate accumulates in the vent pipe dissolves flue gas deposits and ultimately leaks both outside and back into the equipment.

These toxins can have a deadly effect. Gases produced during combustion are very hot and as such easily rise through the flue. There are two types of venting associated with those furnaces single pipe and two pipe systems. If you do not you will need to also install a vent pipe similar to the one you have for the bathroom.

The 3 diameter pipe is cellulose core which is approved by my furnace manufacturer. The flue pipe is connected together by inserting the crimped end of each pipe into the non crimped end of each pipe. 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. It draws air from within the house for combustion.

Without it smoke and other toxic materials will build up inside the house.