The worldwide outbreak of COVID-19 has drastically increased pressure on medical
resources and highlighted the need for rapidly available, large-scale, and low-cost
personal protective equipment (PPE). In this work, an alternative full-face mask is
adapted from a modified snorkel mask to be used as PPE with two medical-grade filters
and a 3D-printed adapter. Since the mask covers the eyes, mouth, and nose, it acts as a
full-face shield, providing additional protection to healthcare workers. The SARS-CoV-2
has a size between 60 nm and 140 nm, and airborne viral particles can be carried by
larger droplets with sizes up to several millimeters. The minimum filtration efficiency
of mechanical and electrostatic filters is usually reached between 30 nm and 300 nm. The
filtration efficiency of different medical filters is measured for particles below 300
nm to cover the size of the SARS-CoV-2 and small virus-laden droplets, and determine the
minimum efficiency. The filtration performance of the adapted full-face mask is
characterized using NaCl particles below 500 nm and different fitting scenarios to
determine the minimum protection efficiency. The mask is compared to a commercial
respirator and characterized according to the EN 149 standard, demonstrating that the
protection fulfills the requirements for the FFP2 level (filtering face-piece 2,
stopping at least 94% of airborne particles). The device shows a good resistance to
several cycles of decontamination (autoclaving and ethanol immersion), is easy to be
produced locally at low cost, and helps to address the shortage in FFP2 masks and face
shields by providing adequate protection to healthcare workers against particles <500
nm in size.
The worldwide outbreak of the COVID-19 drastically increased pressure on medical resources and highlighted the need for rapidly available, large-scale and low-cost personal protective equipment (PPE). In this work, an alternative full-face mask is adapted from a modified snorkel mask to be used as PPE with two medical grade filters and a 3D-printed adapter. As the mask covers the eyes, mouth and nose, it acts as a full-face shield, providing additional protection to healthcare workers. The filtration efficiency of different medical filters is measured for particles below 300 nm to cover the size of the SARS-CoV-2 and small virus-laden droplets. The filtration performance of the adapted full-face mask is characterized using NaCl particles below 500 nm and different fitting scenarios. The mask is compared to a commercial respirator and characterized according to the EN 149 standard, demonstrating that the protection fulfills the requirements for the FFP2 level (filtering face-piece 2, stopping at least 94% of airborne particles). The device shows a good resistance to several cycles of decontamination (autoclaving and ethanol immersion), is easy to be produced locally at low cost and helps addressing the shortage in FFP2 masks and face shields by providing adequate protection to healthcare workers against particles below 500 nm.
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