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I have seen advertising on 90% vs 20% efficient filters, what does that mean?

April 26, 2017Advertising filters mean seen vs

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I have seen advertising on 90% vs 20% efficient filters, what does that mean?

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Whenever you see a percentage of efficiency for any filter you must ask at what size particle (micron) is this percentage. Filters are tested on how many particles they capture at what size. This means that all filters will eventually have a 90% plus efficiency rating at some point in time. The real question is if it is 90% efficient, then what is the micron size that they are testing the filter at. The fact is that the smaller the size particle the lower the percentage of efficiency, and the larger the size particle the higher the percentage, this holds true for all filters. We can also say that the dirtier the filter the higher the percentage and the cleaner the filter the lower the percentage. Unfortunately some manufacturers advertise percentages of dirty filters in order to boast a high percentage, while others give the percentages of large size particles because these are easier to capture and they will result in a high percentage of efficiency.