While roots blower impeller is two rotor, and the interval is very small. The air is exhausted from casing by the two impeller extrusion.
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2. Different working pressure, roots blower outlet air pressure is much higher than centrifugal fan.
3. Different airflow. In general, roots blower is suitable for higher pressure and smaller airflow situation, while centrifugal fan is suitable for larger airflow and lower air pressure situation.
4. Different manufacturing accuracy, roots blower is more precision, and has more strict matching requirements.
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5. Different efficiency, centrifugal fan power saving is more 30% than roots blower.