Coronavirus Respirators and Masks

From Liberland Coronavirus Response Center
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Specifications

HEPA filters from vacuum machines can be used to replace FFP3 (which are missing on the global market) and starting with filter H14 provide even better protection. HEPA filters remove at least 99.97% of airborne particles 0.3 micrometers (μm) in diameter.

HEPA class Retention (total) Retention (local)
E10 > 85% -
E11 > 95% -
E12 > 99.5% -
H13 > 99.95% > 99.75%
H14 > 99.995% > 99.975%
U15 > 99.9995% > 99.9975%
U16 > 99.99995% > 99.99975%
U17 > 99.999995% > 99.9999%

Make your own antiviral filters from salt

Other Links

Make surgical mask: