What type of equipment is used for duct cleaning?

The two main types of equipment used for duct cleaning are Negative Air Duct Cleaning Systems (NADCS) and Rotary Brush Type Systems (RBTS). NADCS usually relies on a huge, powerful vacuum with around 2000-3000 CFM that connects to the duct. The operator will cuts an access hole into the duct line and connects the vacuum. When done properly, the operator will block off areas along the duct with bladders to create a vacuum in sections of the duct. The vacuum then sucks debris back towards the Negative Air Machine. RBTS incorporates a spinning brush that scrubs the ducts and a vacuum that removes the dirt, dust, and debris the brush scrubs off the duct.