求翻译：1、风机采用优质直驱式高效离心风机，具有长寿命、低噪音、免维护、震动小、可无级调速、定时等特性。工作寿命长达3万小时或以上。风机调速性能稳定，在高效过滤器终阻力的状态下仍可保证风量不变。是什么意思？

1, fans high-quality direct drive high efficiency centrifugal fan with long life, low noise, maintenance-free, low vibration, stepless speed control, timing and other features. The working life of up to 30,000 hours or more. Fan speed and stable performance, the final resistance of the state of the

1, the turbine with high quality direct-drive-in high efficiency centrifugal blower with a long life, low noise, and maintenance-free, vibration-free, you can adjust the speed, timing and other characteristics. Long service life up to 30,000 hours or more. Fan speed performance and stability in high

1st, the air blower uses superiorly drives the type highly effective gentrifugalism air blower straightforward, has the long life, the low noise, exempts the maintenance, vibrates slightly, may the stepless speed regulation, fixed time and so on the characteristics.The working life for 30,000 hours

1, fans use very high quality direct-drive high performance centrifugal fans, with a long service life, maintenance-free, low noise, low vibration, stepless speed regulation, regular features. Working life of up to 30,000 hours or more. Fan speed performance stability, high efficiency filter resista