... , imported SKF bearing, F-level insulation, IP54 especially suitable for long-term use, safe and reliable. 3.4 Imported oil filter, oil gas ... than 0.001ppm, the trunk adopts metal pipe, safe for long –term operation without leakage or deformation, the V type drive belt ... . 3.5Air volume auto intelligent control, auto shutdown after over long idle run, ensure over 25% of energy saving.9.6Valve ...