The Evolution Of Air Duct Cleaning Systems

https://www.scribd.com/document/414606041/15-Things-Your-Boss-Wishes-You-Knew-About-Air-Duct-Cleaning-Garland

As this is finished, technicians will operate on the inner duct to rid it of all pollutant like debris. The finest component of the organization is that it does what it says. The airflow have to be pretty constrained.