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Minimum Efficiency Reporting Value
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Most filters incorporating mechanical principles of particle capture become more efficient as they load with dirt. Rather than provide an average efficiency, the committee developed a methodology of reporting a lowest point efficiency value. In this manner, the user would know how efficient the filter is at its lowest point, which in most cases is as soon as it is installed in the system. Other test procedures provide an average efficiency, which may require extensive time to reach in actual operation.
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