EN 405:2001+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 masks
        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 procedure
        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

This European Standard specifies the performance requirements, test methods and marking requirements for valved filtering half masks incorporating either gas or combined filters as respiratory protective devices except for escape purposes. It does not cover gas filtering half masks which do not have valves or are fitted only with exhalation valves. It does not cover devices designed for use in circumstances where there is or might be an oxygen deficiency (oxygen less than a volume fraction of 17 %).Laboratory and practical performance tests are included for the assessment of compliance with the requirements.