Air passage opening and closing device capable of preventing uncomfortable noise

摘要

An air passage opening and closing device for controlling an air flow for air-conditioning a vehicle compartment which is adapted to reduce an uncomfortable noise generated when the opening degree of a door such as an air-mixing door is small is provided, wherein a plurality of extending portions ( 7 g) are provided on tips of the lip seal ( 7 c). The extending dimension (H) of the extending portion ( 7 g) is more than or equal to substantially 1 mm and less than or equal to substantially 3 mm, the dimension (B) in the width direction orthogonal to the extending direction in the extending portion ( 7 g) is more than or equal to substantially 2 mm and less than or equal to substantially 14 mm, and the gap distance (G) between the adjacent extending portions ( 7 g) is more than or equal to substantially 1 mm and less than or equal to substantially 4 mm.