Well, some of that dust, and maybe most of it, came from sanding. But as a flooring installer/finisher, I work in lots of new houses and remodels and they are NEVER clean before I even get started. So some of that dust probably was already there. If it's in the ducting, then a duct cleaning company could clean those ducts. Change the filter on your HVAC unit and then hire a cleaning company experienced in cleaning up homes after building or remodeling. Who pays? I don't know. IMO, the general building contractor needs to foot the bill. His responsibilty to turn over the house clean after completion.
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