Investigate using papra as passive filtration device
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after designing adaptors for #182, design adaptors that do not have filter material attachment points, but rather just attachment points for the 22mm hoses going back to the papra.
This adaptor will likely need 1-way valves to block exhalation from going into the tubes.
Will this design allow for inhalation through the hepa filter? Or will the breathing resistance be too severe?
To be experimented on on a 3M 6k/7k series respirator with adaptors.
Nothing was done quantitatively about measuring resistance.
Tried out the 3M respirator mask with the 1-way filters still installed. Even without the fan on, it works, but not measured in any way, didn't seem harder than breathing through an n95 filter. With it on, it streams enough air that the valves are open in one direction, and unable to overcome the airflow with just breathing in. Think we're OK. Noticed that when it's on, no effort to breathe; the fan may be too powerful where the air is rushing over the face with the seals firmly established in the mask. 1-way valves should be working on a pulsating flow, not a constant flow, don't know if there are other considerations to take into account because we're changing the mask paradigm and if that affects protections.
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