| 摘要 |
PROBLEM TO BE SOLVED: To reduce an installation space and prevent air from flowing back by coupling a check damper equipped chamber to a multiple duct. SOLUTION: A multiple duct system is adapted such that a multiple duct is constructed by freely fitting a plurality of ducts laid in the same direction multiply inside and outside the system, and a base side of the multiple duct is opened to each room as one duct with a tip end of the multiple duct being coupled with a check damper equipped chamber.
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