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3M ff400 Respirator internal exhalation filter

3M ff400 Respirator internal exhalation filter

thingiverse

Collaboration with Juan Manuel Aguilar J resulted in the creation of an internal filter for 3M FF400 re-usable respirators. A photo taken by Juan Manuel Aguilar J documents this achievement. Note that no additional filter is required for the speaker diaphragm. Caution: Use at your own risk.

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