How to Stop a Furnace From Oil Canning


When you turn your furnace on and you hear a knocking or clanking noise, it is known as oil canning. Oil canning occurs when the pipes, or ducts, running from your furnace shift around and vibrate or rattle against the connection site in your home. While the noise can be annoying, it does not mean there is an issue with your furnace, but it is always best to have a professional inspect your furnace to ensure it is in good working condition. Once you know the issue is not your furnace, you can reduce or eliminate the oil canning noise.

Things You'll Need

  • Hammer
  • Rubber gaskets
  • Screwdriver
  • Utility knife
  • Turn on your furnace and pay attention to which ducts, or pipes, are knocking or shaking, leading to the oil-canning noise. Make a note of which ducts are the area of concern.

  • Tap around the connection site, gently, with a hammer. When the connection site has a wooden wall against metal connection, it is a common area to hear the noise. Making small dents along the duct's connection area will tighten the connection and prevent it from being able to wobble around as much. This can also happen with a concrete wall.

  • Disconnect the pipes, or ducts, at the connection site and insert a rubber gasket, or rubber pads, between the metal and the wall. When the pipes and ducts vibrate, the rubber will reduce the noise and possibly eliminate it. The disconnection procedure may vary depending on how the pipes or ducts are connected. It may be as simple as using a screwdriver and unscrewing it, or they may have a sealant holding the connections together, which would require a utility knife to cut through the sealant to loosen it.

Tips & Warnings

  • If you still have noise issues, hire a professional to investigate if you can reroute your ducts to eliminate the noise or if it is possibly an issue with the furnace itself.

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