| 摘要 |
PURPOSE:To provide a fumigation method of the inside of a duct capable of sterilization without use of any device for sterilization. CONSTITUTION:In a fabrication method of the inside of a duct 10 including an eletric dust collector 14 and a heat exchanger 15 through which cold water passes, dampers 12, 18 are provided on the ducts 10 each located on the upstream side of the electric dust collector 14 and the downstream side of the heat exchanger 15, and after interruption of air conditioning both dampers 12, 18 are closed and the electric dust collector 14 is operated intactly for a predetermined time to render the inside of the ducts 10 located between the dampers 12, 18 to ozone gas fumigation. |
