Cavco manufactured homes
Purchased 6 yr. Old Cavco park model. Moved in and had terrible 'dust problem'.investigated and discovered heating ducts were not connected to floor and ' dust ' was fiberglass!
After I moved in to my Cavco home I found out the ever present recurring 'dust 'was actually fiber glass insulation being blown in by the furnace. Only one of the floor heating ducts had a connection to the main heating duct. The remaining floor vents were just blowing into the crawl space, ...