files in this series:
- R1 - UK Standard Assigned Protection Factor 4 (APF 4)
- R2 - UK Standard Assigned Protection Factor 10 (APF 10)
- R3 - UK Standard Assigned Protection Factor 20 (APF 20)
- R4 - UK Standard Assigned Protection Factor 40 (APF 40)
- R5 - Breathing apparatus with UK Standard Assigned Protection Factor 40
- R6 - UK Standard Assigned Protection Factor 2000 (APF 2000)
More information and guidance available on the RPE website.