Abstract: A heating/ventilating/air conditioning (HVAC) air duct cleaning system with certain improvements having a system housing containing a vacuum-generating subsystem, a rotating motor with an output shaft, and a debris reservoir; a hose connection panel on the system housing positioned at an angle of approximately 45 degrees from horizontal; and a hose coupler on the hose connection panel, configured to receive a duct cleaning hose and to transfer rotational energy from the output shaft to a connection end of a rotatable cable when received into the guide portion, wherein the coupler provides coaxial alignment between the guide portion and the output shaft.

Abstract: A improved drive mechanism for coupling a rotatable drive cable to a remote tool, especially for a heating/ventilating/air conditioning (HVAC) air duct cleaning system, having an angled inlet for connecting a remote tool via a rotatable cable, a cable connector guide aligned with the angled inlet for receiving a connection end of the rotatable cable, and a motor such as a brushless direct current (DC) motor with a direct-drive coupling to the connection end of the rotatable connector.