平行叶片风门是ZD系列风门。这些风门的设计使用寿命很长，运行安静，不需要进行维护。
The parallel blade damper is the ZD series damper. These dampers have been designed to provide long life, silent operation and require zero maintenance.
本系列风机的叶片采用特殊扭曲孤度设计，机壳采用法兰翻边工艺，使风机噪音更低，风量更大等特点。
SF (b) series adopt special twisted blade design and flange flanging casing, which makes the noise lower and the air volume larger.
旋翼设计包括桨毂构型、旋翼桨叶片数、旋翼直径、旋翼实度、翼型剖面等一系列影响直升机性能的因素。
Rotor design is comprised of some factors such as hub configuration, blade number, rotor diameter, rotor solidity and airfoil which have effects on helicopter performances.
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