During
construction all HVAC ducts were sealed and the system was not in operation
until all painting/sanding and other dust and mess generating activities were
completed.
The pictures below show floor vents that are sealed with metal and mastic…notice all the dirt, dust and debris that would have gone into the duct had it not been sealed!
Additionally, the home was flushed for 48 hours after all construction was completed to further remove contaminants such as fumes from paints and finishes, off gassing, and dust.