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that noise is a lose damper that is on the collar that conects that duct to the plenum. that duct goes into a big box. right before it goes in there is a collar. it may be taped up so feel for a wing nut under the tape.this nut controls a metal disc that controls the air flow through each duct.that nut came lose you have to tighten it up and the noise will stop. Answer Another cause for the creaking could be as simple as the metal of the duct expanding with the heat and rubbing against a ceiling, floor stringer, stud or wall opening somewhere within the first 10-15 feet of where it comes off the furnace. This creaking is also a common problem with baseboard hot water heating systems where the copper pipes come up through the floors and creak as they heat and expand. To repair the problem, turn up your thermostat and then stand in the area of the furnace and wait for the creaking to start so you can see where it is happening. Then use a piece of mineral wool or other heat resistant material that is soft and non-abrasive to put between the duct and where it is making contact.

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Q: How do you repair a furnace duct that makes creaking noises when warm air flows through it?
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