... 400v 5 Please call us for the detailed parametersFSR80 air exhaust blower|vacuum roots blowerKey Features 1, the product line ... using clover-type impeller, spiral structureexhaust, exhaust pulse gently, less vibration and low noise. 2, the ... safety valve Fourth, special attachments (configured in accordance with contractrequirements) flexible joint, lubricating oil, exhaust muffler