Fig. 6: CAD images of the experiment apparatus used for filter efficiency and breathability testing. | Nature Communications

Fig. 6: CAD images of the experiment apparatus used for filter efficiency and breathability testing.

From: Attaching protein-adsorbing silica particles to the surface of cotton substrates for bioaerosol capture including SARS-CoV-2

Fig. 6: CAD images of the experiment apparatus used for filter efficiency and breathability testing.

a CAD image of the test rig design for the filter material penetration test. i Nebuliser input and entry for clean air to be drawn in. ii Valve to connect to a pre-mask syringe filter to yield a before-mask concentration (BMC). iii Mask material clamped in position. iv Valve to connect to a post-mask syringe filter to yield an after-mask concentration (AMC). v Pressure sensors. vi Fan and exhaust. b CAD image of the test rig design for filter material differential pressure (‘breathability’) tests. i Entry for clean air in (‘mouth’). ii ‘Ears’ used to attach masks. iii Venturi tube. iv Pressure Sensors. v Fan. vi Exhaust (air out).

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