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The mask probably catches some large particles, but it definitely isn't a filter. Most of the air you exhale takes the path of least resistance around the mask rather than through the fabric. I would estimate that a mask inside a PAPR is even less effective at catching particles because of the positive pressure surrounding the mask and essentially amplifying the force of your exhalation.No but if you are infected the mask “should” filter your exhaled breath before the PAPR pushes it out.