Other than your air filters, leaky ductwork is another common culprit for an usual sight of dust. "The ductwork in your HVAC system also transports air throughout your home and can also cause dust," ...

The Sheet Metal and Air Conditioning Contractors’ National Association (SMACNA) has published the fourth edition of its HVAC Duct Systems Inspection Guide.

The pup sniffed his way down a small hole in the floor and into an aluminum duct -- which he couldn’t get out of!