themansells

We own a 2007 Tiffin Allegro Bus and wonder how to go about cleaning the duct work (other than just vacuuming the vents). When the furnace comes on, we can smell dust. Is this something we can do ourselves or should we contact a duct cleaning company? Also wondering if the A/C duct work should be cleaned (not just the ceiling filters which we clean regularly). Any information would be appreciated.