Does Vacu-Man use a duct cleaning brush

No. Negative air pressure is a must when it comes to cleaning air ducts – and it goes without saying that you should definitely steer clear of the brush system. Trying to use one of those can cause major damage; the whip or brush could get stuck on screws or things protruding from the air duct system, which will end up destroying the oil lining base. So if you want to make sure your air ducts stay nice and intact, negative air pressure cleaning is the only way to go!  We have over 40 years of experience understanding the right way to do duct cleaning