fan kit 1.120V/60Hz or 230V/50Hz as requests; 2.Fan kit low speed:800 1800rpm 1.5 2.5m/s, High speed:2500 32rpmmore than 7.5m/s ;and running speed control by hand; 3.Motor insulation class:B or H CLASS ,according requests; 4.Noise less than:50dB;
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