![Oil Filter Clean](https://img.forconstructionpros.com/files/base/acbm/fcp/image/2019/01/oil_filter_clean.5c2f8c4a19e1b.png?auto=format%2Ccompress&fit=crop&h=288&q=70&rect=0%2C150%2C1280%2C720&w=512)
Article originally published on Noria.com
"My filter company uses the following notation to rate one of its filters: BX=2, B10=X, BX=75, followed by these numbers: 5, 8 and 17. I'm familiar with the Beta rating, but I've never seen it shown in this way. What is meant by these numbers?"
This system of rating a filter describes its capture efficiency at three specific points in microns. It actually has many advantages over the more common Beta rating methods used today.