| 摘要 |
PROBLEM TO BE SOLVED: To prevent unpleasant noises due to air leaking out a slightly open blowout port, without decreasing air volume or sealing performance of the packing. SOLUTION: A face door 9 is provided with a concave part 17b inside of a seal portion 17a of a packing 17 that is press-fit to a door seal surface 3a of a ventilator case 3 when the face blowout port is closed. In this case, the concave part 17b is disposed such that an inside corner part 17c of the seal portion 17a (a boundary corner part between the concave part 17b and the seal portion 17a) generally corresponds with an inside corner part 3b of a door seal surface 3a of the case 3. When the face door 9 is slightly open, therefore, it is not possible for the air flown from the upstream to flow along the surface of the packing 17 regularly, and the air flow is disturbed by the concave part 17b. As a result, the flow speed of air passing the gap between the packing 17 and the door seal surface 3a decreases, and generation of abnormal noise is suppressed.
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