Step 3: Inspecting the flue pipe

man inspecting flue pipe of furnace
Photo: Keller & Keller
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Richard checks for holes in the exhaust flue that could leak carbon monoxide, particularly where the pipe meets the furnace. Small holes can be patched with foil tape, but corroded flues must be replaced. He also adjusts the flue pipe's barometric damper, which moderates the chimney draw. "A big, tall chimney in an old house tends to suck too much air, compromising efficiency," he says. "Your service pro can weight the damper to lessen the draw.
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    Tools List

    • Phillips screwdriver
      Screwdriver
    • Wire brush
    • shop vacuum
      Shop vacuum
    • strap wrench
      Strap wrench
    • combustion analyzer
      Combustion analyzer

    Shopping List

    1. Foil tape

    2. Oil filter
    (for oil-powered systems)

    3. Air filter

    4. Oil nozzle
    (for oil-powered systems)