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Terminological database |
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Following the links provided within each record, it is possible to access the legal texts which regulate the concept under examination, the concept diagrams in which it appears, as well as other linguistically or conceptually correlated terminological records.
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Nominal protection factor |
Domain: Health and safety at work => Preventive measures => Personal protective equipment
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| Grammatical category: | Noun phrase |
| Grammar notes: | Countable |
| Definition: | 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: | |
| Variants: | NPF |
| Related terms: | |
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