... size, low noise,ingenious structure,stable air flow,excellent performance Blower Model: HC-251SCapacity scope: 0.28-0.31m3/minPressure ... 50Hz,60Hz About HC-S: The HC-S series rotary blower features high quality construction, and includes the following components: ... motor, air filter, main blower unit, air chamber, common base (with lube oil tank) ...