How to Connect a Flue Pipe

Written by elizabeth knoll
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Flue pipes exhaust hot combustion gases from your appliance to the exterior of the building. They are typically made of single-walled sheet metal. During operation, flue pipes get extremely hot to the touch so combustible materials must be kept a minimum of 18 inches away from the flue pipe. Although it can seem that you would need a skilled craftsman to connect sheet metal flue pipes, the typical homeowner can accomplish this task and only a few tools are required.

Skill level:

Things you need

  • Tape measure
  • Flue pipe
  • Permanent marker
  • Snips
  • Pipe crimper
  • Sheet metal screws
  • Cordless drill
  • Gloves

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  1. 1

    Measure the length of pipe needed. Add 1 1/4 inches to the measurement to allow for pipe overlap.

  2. 2

    Mark out the cut line on your flue pipe with a permanent marker and cut along the line with your snips.

  3. 3

    Crimp one end of the flue pipe. Slide your pipe crimper over the end of the pipe and squeeze together to crimp the pipe. Let go and repeat the process until the pipe is crimped entirely around one end.

  4. 4

    Slide the crimped end of the pipe into the non-crimped end of another flue pipe until it is slid inside 1 1/4-inches.

  5. 5

    Ensure the pipe is installed straight and fasten the flue pipes together with at least three sheet metal screws. The screws should pierce through both flue pipes to hold them together.

Tips and warnings

  • Wear gloves when handling flue piping. The sheet metal edges are extremely sharp and will cause cuts.

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