BS EN 12941 : 1999

Foreword
Introduction
1 Scope
2 Normative references
3 Definitions and description
4 Designation
5 Classification
6 Requirements
  6.1 Materials
  6.2 Resistance to temperature
  6.3 Helmets and hoods
  6.4 Inward leakage
  6.5 Breathing resistance
  6.6 Air supply
  6.7 Checking and warning facilities
  6.8 Clogging
  6.9 Electrical components
  6.10 Breathing hose
  6.11 Filters
  6.12 Noise level
  6.13 Carbon dioxide content of the inhalation air
  6.14 Resistance to flame
  6.15 Exhalation means
  6.16 Mass
  6.17 Practical performance
7 Testing
  7.1 Conditioning
  7.2 Visual inspection
  7.3 Inward leakage
  7.4 Field of vision
  7.5 Visor robustness
  7.6 Breathing resistance
  7.7 Air supply flow rate
  7.8 Clogging
  7.9 Resistance to collapse of breathing hose
  7.10 Strength of hose and couplings and of connection
       between hood and breathing hose
  7.11 Mechanical strength of filters
  7.12 Filters
  7.13 Noise level
  7.14 Carbon dioxide content of the inhalation air
  7.15 Resistance to flame
  7.16 Practical performance
  7.17 Material porosity
8 Marking
9 Information supplied by the manufacturer
Annex A (normative) - Fitting procedure for hoods which seal
        around the neck and which may or may not incorporate
        a head harness
Annex B (informative) - Marking
Annex ZA (informative) - Clauses of this European standard
         addressing essential requirements or other provisions
         of EU Directives

Defines minimum requirements for powered filtering devices incorporating a helmet or a hood with gas, particle or combined filter(s) for respiratory protection.