... rotary type Main features: compact size, low noise,ingenious structure,stable air flow,excellent performance Blower Model: HC-251SCapacity scope: 0.28- ... ,60Hz About HC-S: The HC-S series rotary blower features high quality construction, and includes the following components ... main blower unit, air chamber, common base (with lube oil tank) and oil dropping nozzle. Main Features: Low noise, low power ...