“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?”
“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?”