| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide the structure of preventing dew condensation at the wiring in a ceiling, which can prevent dew condensation due to the temperature difference between the inside and the outside of a duct even if moisture, etc., penetrates into the duct of the cable laid in the ceiling and besides is simple of structure and is inexpensive. <P>SOLUTION: This structure is equipped with a duct 10 for a cable which is laid in the ceiling 1 and at least whose one part is open to the indoor side 4, and a wiring cable 11 for performing wiring by passing its inside. An opening 10a to the indoor side of the cable wiring duct is provided with a seal means 12 and 13 which prevent penetration of moisture into the duct. Furthermore, the section positioned within the ceiling of the cable wiring duct is provided with a dew condensation preventive means 20 which can connect the interior of the duct with the space in the ceiling, for example, a plurality of perforations 21 provided at a part of the duct, a slit, or a mesh pipe 23 constituting a part of the duct. <P>COPYRIGHT: (C)2004,JPO |
