The present invention relates to duct systems, registers and ductwork components used with floor or ceiling registers employed in warm air heating, ventilating and air conditioning systems, and specifically to improvements for mounting and installing the components of the duct system, including register boots, mud rings and register grilles, in the walls, floors or ceilings of buildings. The rotary disk base is mounted on a drive shaft of a circular saw. The pad body is disposed on the pad part for contacting with a user’s nose. In response to detecting the candidate violating vehicle, the method includes tracking at least one trajectory of the detected candidate violating vehicle across a number of frames. A content of the polycyclic aromatic hydrocarbon is 0% to 2. As a result, image forming can be started earlier compared with the case in which image forming is prepared after the image data is transmitted.