COVID-19 Mask for P3R filter (Montana derived)
thingiverse
I've made adapters for Montana masks to fit the P3R filter, as well as a second version with direct threading for that same filter. The P3R filter is a military-grade air purifier that filters out particles larger than those stopped by FFP3 masks, and it's widely available across Europe. This filter has been certified for use in hospitals for up to two weeks, and its lifespan extends even further when used outside of medical settings. Typically, the cost of this high-quality filter is around 15 euros.
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