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The Assigned Protection Factor is a number rating, used in UK legislation, to indicate the level of protection an item of Respiratory Protective Equipment is capable of providing.
Theoretical level of protection of a respirator calculated using data on the performance measured in the laboratory. Calculated by dividing 100 by the total value of maximum internal leak authorized as specified in the relevant standard.
For example: mask EN 149 FFP3 class has a maximum permissible internal leakage level of 2 %. So: NPF = 100/2 = 50.