Filter Ratings - Absolute | Noria Message Boards

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In the article "Understanding Filter Efficiency and Beta Ratios," The author says that the Absolute rating is the size of the largest particle that will pass through the filter. I thought the Absolute rating was the size of the particle for which the filter had a Beta rating of at least 75 (98.7% efficiency). Which is right?

6/15/081:47 PM

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Original Post

robertcMember

As I understand it,

Absolute can be measured by looking at the filter media with a microscope.

Beta ratio takes an actual flow test.

I trust Betas.

6/17/0810:24 AM

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