Disposable Masks

If your workplace cannot achieve adequate control from LEV alone, or if it is not reasonably practicable to provide LEV, workers must be provided with suitable respiratory protective equipment (RPE). For example, if they're welding with LEV but not all the fume is captured you might be able to see residual uncaptured fume, or in the case of TIG welding, smell uncaptured ozone, then you're not controlling the risk and you should also provide respiratory protective equipment. 

FFP3 disposable mask or half-mask with P3 filter, for work of up to an hour, only for use when clean-shaven and with appropriate fit testing carried out.