| 摘要 |
PROBLEM TO BE SOLVED: To provide a ventilation duct capable of suppressing noise due to repeated opening/closing of a flap with a very low cost and improving ventilating performance. SOLUTION: This ventilation duct is provided with a frame body 1 forming an opening O for discharging interior air to the outside of a vehicle and a flexible plate type flap 1 arranged so as to close the opening O by its self-weight on the vehicle outside of the frame body 1 and opened only in the outward direction by an air pressure difference between the inside and the outside of a vehicle cabin or a wind pressure. The ventilation duct is also provided with a rib 11 integrally formed in the frame body 1 for partitioning the opening O in grid form and a projection part 21 arranged on the flap face side facing the opening O and abutting on the middle position of the rib 11 when the opening O is closed by the flap 2. When the flap 2 closes the opening O, the flap 2 abuts on the opening outer circumferential edge 12, while the flap part around the projection part 21 is lifted from the rib 11.
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