Respirator Minus One Prefilter

The 3M respirator mask has two replaceable cartridges, each of which also has an outer particulate filter ("pre-filter") held in place by a filter retainer. In this shot, the particulate filter and retainer are in place on the right, while the filter on the left has had the retainer and pre-filter removed.

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Uploaded on September 22, 2020
Taken on September 22, 2020