Tamaracks Power-Vac truck is the more powerful then portable equipment and truck mounted units. We do residential and commercial duct cleanings along with chimney sweeps and dryer vent cleaning all using our Power-Vac truck. The vacuum of the truck is 1600 CFM and the whipping hose has up to 250 PSI. Two 8 inch holes on average have to cut into the duct work for our vacuum side and 1 inch holes will be drilled into the duct work to whip the system out using high pressure air and the vacuum to work in conjunction.  The whip has the capability to travel from one end of the duct to the other and pulling everything back to the vacuum. When the job is complete everything is patched and sealed 100%.