Gilliam Power Vac Furnace
Most of house dust comes from your ductwork system. Every time your furnace blower kicks on dust is shot out of your warm air registers and is drawn across the room into your cold air returns. This is an endless cycle, leaving dust on the furniture and floors on a daily basis.
Above are some pictures a customer took and shared with us. His wife had to work and he took them so she could see where all her dust was coming from. This was many years of dust, dirt and debris mixed with pet hair, filing the entire trunk line of their heating/ac system.