Respirators may be used when engineering and work practice controls are not technicallyfeasible, or when they fail and need to be supplemented. The filter class for the respiratormust be suitable for the maximum expected contaminant concentration(gas/vapour/aerosol/particulates) that may arise when handling the product. If thisconcentration is exceeded, self-contained breathing apparatus must be used. The type ofrespiratory protection will depend on the conditions of use (see also EN 149).
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