Flue pipes are made out of single-wall galvanized sheet metal. The galvanized coating protects the sheet metal from rusting. Flue pipes transport hot gases from an appliance to the exterior of your home. These hot gases can have a corrosive effect on metal which can eventually eat through the galvanized coating. Once the coating is eroded, the moisture in the hot gases can rust through your flue pipe. If your flue pipe rusts through, you will want to replace it. While replacing it can look complicated, it is actually a fairly straightforward task.
Things You'll Need
- Cordless drill
- Tape measure
- Flue pipe
- Pipe crimper
- Sheet metal screws
Look over the section of flue pipe you want to replace. On both ends it will be attached to other sections of flue pipe with sheet metal screws.
Unscrew the sheet metal screws from the section of flue pipe you wish to replace. Slide the flue pipe out of the other sections of flue pipe.
Measure the length of the flue pipe and prepare a replacement piece by cutting a piece of flue pipe to the correct length using your snips.
Crimp one end with your pipe crimper. Slide the crimper over one end and squeeze to place a crimp on the pipe. Unsqueeze the crimper, position it next to the crimp and squeeze again. Repeat this until it is crimped around the entire end.
Slide the flue pipe into place between the existing sections of flue pipe. Each end of the flue pipe should overlap the other section by 1 1/4 inches.
Install sheet metal screws on each end of the flue pipe to secure it in place. Use three to four sheet metal screws per connection.
Tips & Warnings
- Turn off the appliance in question when replacing the section of flue pipe. This will prevent the appliance from turning on and dispensing toxic gases into your working area while the pipe is disconnected.
- Woodheat: Flue Pipe Installation Rules
- Timothy Gonyo; Sheet Metal Workers Local #18; Milwaukee, WI
- Photo Credit PhotoObjects.net/PhotoObjects.net/Getty Images
The Symptoms of Teflon Flu
Teflon flu refers to a condition that results from inhaling the fumes of heated polytetrafluoroethylene, more commonly known as Teflon. Teflon is...
How to Install a Class A Metal Flue
Because poking stovepipe out a window is not an option, any wood stove, oil furnace or other appliance with the capacity to...
How to Repair a Furnace Flue
A furnace flue directs the poisonous products of combustion out of your home. It typically runs from the furnace to a chimney....
How do I Replace a Manual Damper in a Fireplace Flue Pipe?
If you have a fireplace, you need to have a damper to help regulate the flow of air inside the duct or...
Alternatives to Replacing a Flue Liner in a Fireplace
Over time, the mix of foundation shifting, weather and creosote buildup break down the mortar joints that hold the chimney flue in...
What Are the Causes of Flue Pipe Corrosion?
A flue pipe is typically found on gas and electric water heaters. It funnels steam and hot gases outside that the water...