NEN EN 405 : 2002 + A1 2009

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Description
5 Classification
   5.1 General
   5.2 Types of gas filtering half mask
        5.2.1 Valved gas filtering half masks
        5.2.2 Valved multi-type gas filtering half masks
        5.2.3 Valved combined filtering half masks
   5.3 Designs of combined valved filtering half masks
   5.4 Classes of valved gas filtering half masks
6 Designation
7 Requirements
   7.1 General
   7.2 Nominal values and tolerances
   7.3 Visual inspection
   7.4 Packaging
   7.5 Practical performance
   7.6 Leakage
   7.7 Filter penetration/capacity
        7.7.1 Particle filter penetration
        7.7.2 Gas filtering capacity
   7.8 Finish of parts
   7.9 Inhalation and exhalation valves
   7.10 Breathing resistance
        7.10.1 General
        7.10.2 Inhalation resistance
        7.10.3 Exhalation resistance
   7.11 Clogging
        7.11.1 General
        7.11.2 Devices with separable particle filters
        7.11.3 Devices with integral or separable particle filters
        7.11.4 Exhalation resistance
   7.12 Compatibility with skin
   7.13 Flammability
   7.14 Carbon dioxide content of the inhalation air
   7.15 Head harness
   7.16 Field of vision
   7.17 Demountable parts
8 Testing
   8.1 General
   8.2 Visual inspection
   8.3 Conditioning
        8.3.1 General
        8.3.2 Donning and doffing
        8.3.3 Temperature
        8.3.4 Mechanical strength
   8.4 Practical performance
        8.4.1 General
        8.4.2 Walking test
        8.4.3 Work simulation test
   8.5 Inward Leakage
        8.5.1 General
        8.5.2 Principle
        8.5.3 Apparatus
        8.5.4 Conditioning and number of test samples
        8.5.5 Test subjects
        8.5.6 Preparation of samples
        8.5.7 Test procedures
        8.5.8 Test using sulfur hexafluroide as test agent
        8.5.9 Test using sodium chloride as test agent
   8.6 Gas filtering capacity
   8.7 Flammability
   8.8 Carbon dioxide content of the inhalation air
   8.9 Breathing resistance
   8.10 Strength of attachment exhalation valve housing
9 Marking
   9.1 Packaging
   9.2 Valved gas filtering half mask with separable
        particle filters
        9.2.1 Valved gas filtering half mask
        9.2.2 Separable particle filters
   9.3 Valved gas filtering half masks with integral filters
10 Information supplied by the manufacturer
Annex A (informative) Marking
Annex ZA (informative) Clauses of this European Standard
         addressing requirements or other provisions of
         EU Directives
Bibliography