What is a BETA value?
The Beta value is a separation degree of a filter element determined in the so-called Multipass test to ISO 4572. It is a non-dimensional number which can be calculated by dividing the number of particles (of a certain size) before the filter element by the number of particles after the filter element. E.g. you count 1000 particles bigger or equal 10 micron berfore the filter and only 5 particles bigger or equal 10 micron after the filter that brings to 1000/5 = 200. So we have a BETA value of 200 for 10 micron particles.
