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Employers must use engineering and work practice controls as the primary way keep exposures at or below the PEL. Engineering controls include using process isolation, ventilated enclosures, or local exhaust ventilation to keep beryllium from being dispersed throughout a work area.
Examples of work practices to control beryllium exposures include keeping surfaces clean by using a HEPA-filtered vacuum or by wetting down dust before sweeping it up. If engineering and work practice controls cannot keep exposures at or below the PEL, employers must provide respiratory protection to affected employees.