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Nominal protection factor
Domain: Health and safety at work => Preventive measures => Personal protective equipment
Grammatical category
Noun phrase
Grammar notes
Theoretical protection level of a respirator based on laboratory measured performance data.

Calculated by dividing 100 by the maximum allowed Total Inward Leakage value as specified in the relevant Standard. For example: EN149 class FFP3 has a maximum allowed total inward leakage of 2%. 100 divided by 2 equals 50. Therefore the NPF of an FFP3 respirator is 50.
Definition source
Occupational Health & Environmental Safety - Glossary for Respiratory Protection
European legislation
Directives 89/391/EEC, 89/656/EEC, 89/686/EEC
British legislation
The Personal Protective Equipment Regulations 2002
Contained in
Related terms