BS EN 145:1998 Respiratory protective devices. Self-contained closed-circuit breathing apparatus compressed oxygen or compressed oxygen-nitrogen type. Requirements, testing, marking
This European Standard specifies minimum requirements for self-contained closed-circuit breathing apparatus, compressed oxygen (O2) and compressed oxygen-nitrogen (O2 - N2) types, used as respiratory protective devices, except escape apparatus and diving apparatus. Laboratory and practical performance tests are included for the assessment of compliance with the requirements.