Furnace Flue Pipe Installation

In the old masonry chimneys the tile flues can crack or break over time due to the effects of repeated heating and cooling of the air inside the chimney.

Furnace flue pipe installation.

Installing a flue pipe is the most important part of the installation of your new furnace. You would core a hole 1 4 to 1 2 inch bigger than the outer diameter of the pipe. Run vertical pipe up through the ceiling and roof. Galvanized flue pipes must not be used because the coatings vaporize at high temperatures and release dangerous gases.

Without it smoke and other toxic materials will build up inside the house. 6 7 and 8 inch diameter flue pipes must be at least 24 gauge in thickness. The size would depend on your furnace s flue pipe connection. The pipe then slips into the hole and is sealed with a high temperature silicone caulk.

Pitch the flue pipe up toward the chimney. This allows the hot combustion gases to to move into the chimney easier. Cut a framing hole at least 10 inches in diameter with a jigsaw tool. Use black painted flue pipes.

Flue pipe is too small for the amount of combustion gases generated by the furnace. Flue pipe joints should overlap 30 mm 1 1 4 in each joint in the assembly must be fastened with at least three screws. 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. These toxins can have a deadly effect.