Noisy Heating Ducts

Any loud reoccurring noise in the house can be extremely annoying. Having noisy heating ducts is a common problem that can be fixed by a professional. There may be some labor costs involved, but it does mean a quieter household.

What Causes the Noise

Most heating ducts are made of metal. Metal conducts noise easily from the unit handling the air all the way to your room. If a popping sound comes from the ducts, it may be due to thermal expansion. It can also be causes by a loose piece of metal being caught by the air passing through.

If you track down the duct runs, you may be able to pinpoint where the sound is coming from. If you are able to locate the sound, making a small dent in the metal can provide a sturdier surface that will not move is easily when the air temperature changes. This can solve one type of noisy heating ducts.

Expansion and contraction is the main cause of noisy heating ducts. Due to the nature of ducts, with alternating cold and hot air coming into the ducts at different times, the ducts are prone to expanding contract with the temperature.

There may also be ticking or clicking noises that come from the metal ducts and other parts of the system, like fans, that rub against the wood frame of the house. The ducts and pipes will actually get larger as they are heated by warm air blowing through. This is a normal and expected occurrence, but that doesn't mean you have to have noisy air ducts.

Ending the Noise

Experienced professionals who understand the way that metal ducts and PVC pipes removed with changing temperature can do things to fix the problem. The pipes need to be isolated so that they are unable to touch the house’s wood framing.

One example of this is having a large heating ducts installed so that it is suspended under the floor joists without touching any wood framing. If the duct is isolated by only 1 inch, it should not cause any noisy heating ducts.

There is a part, called the expansion joint collar, which separates the large heating duct from the metal parts of the furnace. This small part will absorb a large amount of the actions that cause noisy heating ducts, namely the expansion and contraction.

It is also possible to enlarge holes for the pipes and ducts to be able to fit through. A professional performing this action can check the pipe to make sure it moves freely through the framing members or studs. They can show her that this movement stays free means that during expansion and contraction the pipe will not get into a bind.

Though metal is well known for creating noise with the changing temperatures, PVC drain lines are also infamous noisemakers. This type of plastic expands and contracts in just the way metal does. It must be allowed to move freely as well in order to stop noisy heating ducts before they start.

Ending the plumbing noise when it exists somewhere in the plumbing lines is not as easy as simply fixing the duct. The exact point where the trouble is occurring has to be pinpointed before a real repair can be conducted. A plumber should be able to test the plumbing system in order to find the area that needs to be repaired.

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