CMI Hank Valenzano on a drain and duct camera inspections episode of NACHI.TV.

Sewer drain inspection with Certified Master Inspector Hank Valenzano of Double Check Home Inspection and his camera.
System produces a video of the inside of the drain pipes all the way to the main at the street.
Sewer drain camera system (left).  Duct work camera system (right).
Nick filming NACHI.TV episode as Hank inspects duct work with his duct camera. 
The camera can also be used to inspect heat exchangers.
A very motley production crew:  Nick, Erin, Hank, Valerie, Kenton, Paige, and Lisa, June 11, 2008.
The drain and duct camera inspection episode is at www.NACHI.TV!