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What is the difference between absolute and nominal ratings?

April 26, 2017difference nominal ratings

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What is the difference between absolute and nominal ratings?

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Nominal rating usually means the filter can capture a given percentage of particles of a stated size (e.g. 50% @ 10 micron). Absolute rating is the smallest typical particle size retained by a filter media at 98+% efficiency. This is also referred to as the Beta=75 or 98.67% efficiency rating.