To obtain a disassembling structure of an electric apparatus easy to be disassembled when discarded by providing a knock-out structure capable of opening a size capable of taking out a large-sized component to a case for the equipment associated with the component in the case.

A knock-out structure 15 capable of opening in size capable of taking out each blower unit is provided at a projecting plane of the each blower unit or a position corresponding to a projecting side face in a body case 2. In the case of discarding a heat exchange ventilator of such a constitution, a heat exchanger inserted into and mounted at a heat exchanger attaching/ detaching structure of the case 2 is drawn, and the exchanger is separated from the case. A heat insulator covering an outer periphery of the case is released together with release paper from an outer surface of the case 2 at the paper. The structure 1 of the case 2 is punched and opened, a holding member is drawn from here and an engaging portion is drawn from a cutout hole, and the unit is drawn from the opening portion.