Once the ducts were cleaned well enough, they resealed all of the joints to prevent this from happening again
It wasn’t too long ago that I thought nothing about the air I breathe inside my dwelling. While the air quality outdoors often garnered my attention, the inside air didn’t raise a blip on my radar. I installed a whole dwelling air purification system in my Heating and Air Conditioning air handler some years back. It has done a fabulous task of reducing allergens and other exhausting stuff in the household air. I figured that was all I required. I was wrong. There were rodent droppings showing up in nearly every space of the dwelling. But, they were showing up in the most conspicuous locales. It took me a couple of days to realize that the rodent droppings were actually falling from the vents in the ceiling. An immediate call was placed to the exterminator who informed me that my air ducts were infested with a bunch of rodents. Evidently, they were able to slip into the gaps in the sections of ductwork because they had sagged and broken the seals. As soon as I had the rodent drawback handled I called the heating and cooling folks. They sent out a crew to thoroughly scrub all the air ducts throughout my dwelling. I was impressed by their attention to detail. But, I was entirely repulsed by the amount of crud that came out of my duct system. Once the ducts were cleaned well enough, they resealed all of the joints to prevent this from happening again. They also made the recommendation that I get someone out to completely seal the perimeter of the attic to help mitigate the rodents getting in at all. I know the lesson is it takes more than just an air purifier to keep the air perfectly clean in your home. You got to get those ducts cleaned regularly as well!