| 摘要 |
PROBLEM TO BE SOLVED: To prevent a duct from being inflated or a channel from becoming narrow in ventilation by integrating a rib being extended in the flow direction of fluid in a duct into a ventilation duct made of an elastomer so that opposing wall surfaces can be connected. SOLUTION: In a rubber ventilation duct 1 whose side section is in nearly a rectangular shape, a ventilation channel provided at a structure is provided at a ventilation port, a pair of collar-shaped flange parts 2 are provided at both end parts in a flow direction A of ventilation, and the duct 1 is fixed to the structure via the pair of flange parts 2 and a mounting metal fitting. A plurality of ribs 3 are formed in one piece at the ventilation duct 1 so that they are extended along the flow direction A of fluid and opposing wall surfaces 10 and 10 in the duct 1 are connected, thus dividing a channel 4 in the duct 1 into a plurality of portions. Also, an inflation part 5 is formed at one portion of the flow direction A of the duct 1 to allow for the expansion and contraction in the flow direction A of the duct 1.
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