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Ratings are expressed as a code: The first two characters (letters) designate the typical application for that cartridge or "application indicator" - BR = Breathing Air
- DR = Air/Gas Drying
- CL = Air/Gas Cleaning
- DD = Air/Gas Sweetening
- CM = Carbon Monoxide Removal
- CD = Carbon Dioxide Removal
- ND = Inert Gas Drying
- NG = Natural Gas Drying
- PA = Particulate Removal
- OY = Oxygen
The numerical character (digits) designate the performance scale - with a range of 1 to 10 we'll call this the"Performance Rating". - 1 = Poorest
- 5 = Standard
- 10 = Best
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