I am getting into sales for Merlin's Industrial Machining.  I used to do cold calling for my brother ,years ago, who used to own Advanced Cleaning Technologies (now he works for Zero Rez).  I used to get him A LOT of jobs for air duct cleaning.  Now I'm actually selling duct cleaning machines (The Duct Wizard) and wanted to see how many of y'all use air duct cleaning in your business if so what machine.  What do y'all feel the pros and cons are of adding Duct cleaning to your business are?  Would you rather buy direct from the manufacturer or go through a a supplier like Bridgepoint.  Any info or comments would be helpful.