Respiratory protection with filters is dependent on the ambient air. In order to use filtering respirators, the type, properties and composition of the hazardous agent in the ambient air must be known. The oxygen content in the inhalation air must be at least 17 vol.%. When using particle filters, no hazardous gases must be present; when using gas filters, no hazardous particles. In case of doubt combined filter must be used. See also our Filter Selection Guide.
