This group of mask includes a wide range of manuafacturers. Some with better science than others. Some claim to filter for 99.9% of viruses. Nano mask are masks made of nano fibers. However, depending on the fiber used and mask construction, the health risk may be greater that the progective benfits. The Nanoparticles used in making of the fibers may end up damaging the lungs.
Nano masks are made with nano material or have nano particles attached to a filter.
Standard surgical masks are as effective as respirator masks (e.g. N95, FFP2, FFP3) for preventing infection of healthcare workers in outbreaks of viral respiratory illnesses such as influenza. No head to head trial of these masks in COVID-19 has yet been published, and neither type of mask prevents all infection. Both types of mask need to be used in combination with other PPE measures. Respirator masks are recommended for protection during aerosol generating procedures (AGPs). Rapid reviews on wider PPE measures, and what counts as an AGP, are ongoing.
(March 24, 2020) The Centre for Evidence-Based Medicine
Masks may be more effective as a “source control” because they can prevent larger expelled droplets from evaporating into smaller droplets that can travel farther.
(June 26, 2020) The University of California-San Francisco
If you are a mask manufacturer and want your face mask to be considered for publication on our website, please send a sample supply for review along with a press release. We'll then donate your masks to local organizations including medical personnel and front line workers. Only quality masks will be considered for review and highlighted on our website.