Abstract: An apparatus for sampling dust in a duct for the purpose of knowing, in advance a need for cleaning the inside of such a narrow duct as can not be accessed internally by a person, the kinds of accumulations in the duct and the state of accumulation and sticking or the like. The apparatus comprises a traveling truck enabled to travel forwardly and backwardly in the duct, a TV camera mounted on the traveling truck in order to observe the inside of the duct, a sampling bucket attached to the front of the traveling truck in order to sample accumulations in the duct and a remote control portion for remotely controlling the traveling truck, the TV camera and the sampling bucket.

Abstract: A system including an apparatus for cleaning an inside surface of a duct. The system includes a traveling portion and a remote-control monitor portion. The traveling portion includes a traveling truck and the truck carries a compressed air ejector and a video camera, and the remote-control monitor portion receives images from the video camera to control remotely the traveling portion while monitoring a front view of the traveling portion in accordance with the signal coming from the video camera. The compressed air ejector is equipped with a rotating nozzle for ejecting compressed air toward the duct inside surface in an oblique direction in front of the traveling truck. An air compressor can be carried by the truck or the compressed air can be fed to the nozzle ejector via a hose from outside the duct.

Abstract: An in-duct searching apparatus characterized by comprising a traveling truck, a video camera for in-duct observation on board the traveling truck, a singular or plural compressed air ejecting nozzle, and a monitor/remote-control portion for remotely controlling the traveling truck and the video camera and the compressed air ejecting nozzle; wherein the compressed air ejecting nozzle ejects compressed air toward the alien substances inside the duct which have been observed by the video camera, for grasping their properties.