你经历过你不舒服，你必须检查它配备了烟管流动凡通风风扇罩无法访问或曾在密闭空间在哪里？
Have you ever experienced you were uncomfortable when you had to check air flow with a smoke tube where ventilation fan or hood was unreachable or was located at confined space?
气流由大旋风收集器上端回风管吸入鼓风机，本机整个气流系统是密闭循环的，并且是在正负状态下循环流动的。
Airflow from the large cyclone collector inhalation top return air duct blower, this machine is a closed loop system, the air flow, and circulation in the flow of positive and negative state.
雷蒙磨粉机的气流系统是密闭循环的，并且是在正负状态下循环流动的。
Raymond mill is a closed loop air flow system, and circulation in the flow of positive and negative state.
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