Increasing horsepower without increasing RPM's may not necessarily improve performance. Motor horsepower is determined by the amps required to turn the fan at a given speed on a pre-determined voltage -- 1800 RPM or 3600 RPM are standard. The performance of a fan depends on the size, shape and speed of the impeller. Factors like cost optimization, power rating and noise levels govern the selection of a fan suitable for a given application. Two measurements are commonly used to describe the physical characteristics of a fan -- blade diameter and motor horsepower. While these are useful measures, without the proper combination of airflow rate and static pressure capabilities, they only give a very general idea of fan capacity. Neither pressure alone nor volume alone can effectively move fluid. The correct combination of both pressure and volume provides complete vehicle coverage with adequate force to remove properly treated rinse water. A small amount of pressure can break the surface tension and allow the volume, along with its accompanying weight, to effectively move the water. This concept can be easily understood using the following example: Utilizing a zero degree nozzle, attempt to wash debris from a driveway. The narrow nozzle delivers water at a high pressure, but volume is reduced, cleaning only a narrow path and is not effective in pushing a quantity of debris forward. Adjusting the nozzle to a wider path increases the volume of water (and thereby the weight). Although the pressure is slightly decreased, the increased weight of the water along with the increased path width effectively carries more debris forward.
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