Something is camouflaged in the bathroom ductwork

During the last few weeks, I’ve heard a odd sound in the ductwork above my bathroom.

At first, the noise was faint plus subtle.

I only heard the odd sound in the middle of the night. Yesterday, I started hearing the odd faint sounds while in the afternoon as well. My husband has been out of town on business for the past 3 weeks, so I cannot have him check on the problem. I wasn’t going to pay a business to come out plus look at the ductwork, but I was afraid that an pet was stuck in the attic, then one of my coworkers got me upset when they told me that an exterminator found a litter of kittens in her attic ductwork. I doubt it highly that the problem was a litter of kittens or puppies, but the noise wasn’t going away. I contacted the Heating, Ventilation, plus A/C business first, plus they gave me an appointment for the next afternoon. On Tuesday, the Heating, Ventilation, plus A/C worker came over to check on the problem. He removed the wall board from our attic entrance plus carefully climbed into the ceiling. He was gone for 20 or 30 fourths, before I saw his face again. He came down the stairs plus grabbed some additional tools. He gave me no further information at that time. He was gone in the attic for another thirty fourths, but when he finally came back, he was carrying several small pieces of sheet metal. The Heating, Ventilation, plus A/C worker told me that the ducting metal was loose, plus it was rubbing together every time the Heating, Ventilation, plus A/C component was on. That was the source of my odd sound.

Heating equipment