Abstract: A duct cleaning device including a flexible conduit having a first end and a second end with inlets at first end and outlets at second end to allow air to circulate within the conduit. A whipper located at first end is rotated by a drive shaft, housed within the conduit, and powered by an air-activated drive system located near to the whipper at first end of the conduit. A stationary circular brush is also located around the conduit near its first end. In operation, the air-activated drive system is activated by air passing though the conduit preferably when a vacuum is applied. The vacuum is created a pressure reducing air pump To which the second end of the conduit is attached. The device may be mounted with a dolly, and displaced within a duct using rods attached to the dolly. The loosened debris generated by the action of The whipper and brush on the internal surfaces of the duct are aspirated through the inlets and into the conduit by the vacuum.

Abstract: A van-mounted or mountable cleaning system as disclosed includes a water heater having a burner therein to heat the water and a flue outlet to release combustion gases therefrom. A motor driven vacuum blower has an air input port and an output port for blower exhaust, both the water heater and the vacuum blower being mounted or mountable in an interior portion of the van body. A flue gas duct is connected to said flue outlet and extends downwardly toward lower extremities of the van body and then, in use, leads outwardly of the van body. An exhaust conduit enters into said flue gas duct in such manner as to create a Venturi effect therewith tending to draw combustion gases away from said burner along said downwardly extending flue gas duct and thence outwardly of a lower portion of the van body in which the system is installed.