Keywords:
Breathing apparatus, Classification, Definitions, Dust, Facepieces, Filtering devices, Filters, Fixed, Identification colour codes, Instructions for use, Laboratory testing, Liquid, Marking, Materials, Occupational safety, Particle filters, Particles, Pressure gradients, Protective clothing, Protective equipment, Respirators, Respiratory protections, Safety engineering, Specification (approval), Testing, Transmission ratios, Workplace safety