"Blower Fan" old throttle and sliding doors Appearance: throttle required tightness, had been using the rubber and urethane. The newly developed sliding door thickness less than 1mm, using a deformed under wind pressure, thereby effecting sealing mechanism. The material used for automobiles are commonly used polypropylene (PP). In order to take into account two contradictory characteristics, we have taken the following methods: a gear part of the general thickness, it has had a rigid material. The damper part is as thin as possible, increase flexibility, making it possible to achieve by means of pressure seal.