Furnace Flue Pipe Installation

Run vertical pipe up through the ceiling and roof.

Furnace flue pipe installation.

Galvanized flue pipes must not be used because the coatings vaporize at high temperatures and release dangerous gases. Cut a framing hole at least 10 inches in diameter with a jigsaw tool. A flue pipe is a metal pipe that either stands alone as a chimney pipe leading from a furnace or runs inside a masonry 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.

Use black painted flue pipes. 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. Without it smoke and other toxic materials will build up inside the house. Pull away insulation or install an insulation shield to keep the area clear around the pipe.

Pitch the flue pipe up toward the chimney. You would core a hole 1 4 to 1 2 inch bigger than the outer diameter of the pipe. 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 pipe then slips into the hole and is sealed with a high temperature silicone caulk.

Installing a flue pipe is the most important part of the installation of your new furnace. These toxins can have a deadly effect. Check the area where you will install the flue pipe. Flue pipe is too small for the amount of combustion gases generated by the furnace.