| 摘要 |
PROBLEM TO BE SOLVED: To provide a duct for an air conditioner, which can be conducted more safely and favorably, and causes fewer troubles in the case of its removal. SOLUTION: A plurality of tubes 11 made of corrugated board are joined with adhesive tapes 12 into a duct 10. The necessary strength of the duct is obtained, by overlaying a plurality of corrugated boards on top of anther.
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