The Air-Care DuctMaster 3 Contact Cleaning Machine is used to pull debris out of dryer vents, commercial ducts, chimneys and restoration areas. The 3 in. vacuum hose is ideal for collecting construction debris without clogging and can also be used to clean a 4 in. dryer vent. The rotating brush loosens debris while the vacuum feature removes it from the space. Suitable for use in residential buildings and in most commercial facilities. You'll also appreciate that this duct cleaning machine comes backed by a 1-year limited warranty for peace of mind.