... spiral line, all these prevent the pulse noise and vibration. What's more, by using the Impedance complex muffler, the ... almost no vibration.3. Long life. The blower bearing what we used are all double-row and Self-aligning bearing.4. ... 2130rpm ZYSR series roots blower applicationsZYSR series roots blower widely used in electricity,petroleum,steel industry,smelling,food,oxygen making,spinning,paper ...