NIOSH Recommended Guidelines for Personal Respiratory Protection of Workers in Health-Care Facilities Potentially Exposed to Tuberculosis/Figure 3

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Figure 3—Example C of a NIOSH-Certified, Positive-Pressure, Air-Line, Halfmask Respirator (MSA Pressure Demand Air-Line Respirator, NIOSH approval TC-19C-158).

A different MSA positive pressure halfmask respirator