Upon arrival, the company brought their equipment in. The first thing my husband noticed was that the equipment was new and of commercial grade. The process in which the ventilation was cleaned was very efficient, cleaned the ductwork, did not allow any of the dirt/debris back into the ventilation system or into the house, and did not harm the duct work. After cleaning an antimicrobial was put into the ventilation system. The technician noticed chimney damage and wrote an estimate for this as well.