preheating evaporator 预热蒸发器 preheating fan 预热风机 preheating fluorescent lamp ballast without starter 无启动器的预热式荧光灯镇流器 ..
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The recuperators have high air resistance , low air preheating temperature and high fan pressure head , and fan has much noise to environment and are apt to break down with vibration .
此换热器空气阻力大，空气预热温度不高，风机压头高，环境噪声大，风机振动大、易损坏。
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