Heres a video of a duct cleaning we completed, with a before and after of the same ductwork! This video shows our patented dislodging system at work as our 16,000 cfm truck mounted vacuum sucks out the dust and debris. Advanced Furnace & Air duct cleaning is family owned and operated and we have been in business since 1964! We use truck mounted vacuums with 16,000 cfms of vacuum(equal to about 300 mph wind) and a patented dislodging system that can clean all types of ductwork! We have done over