The Union Health Ministry has warned against the use of N95 masks with valved respirators, which is basically the raised plastic disk that is embedded in the fibre. In May, the San Francisco Department of Public Health had warned of the inappropriate usage of N95 masks.
Daily Current Affairs Quiz 2020
Key-Points
N95 masks are personal protective equipment that protects the wearer from airborne particles and from liquid contaminating the face. N95 masks are worn mostly by healthcare workers.
N95 masks filter about 95 per cent of particles smaller than 300 nanometres (1 nm is a billionth part of a metre). SARS-CoV-2, the virus that causes Covid-19, however, is in the size range of 65-125 nm.
The valve or the raised plastic gasket found in some N95 mask models basically filters the air inhaled by the person and blocks the entry of pathogens suspended in the air.
The valves allow easier exhalation than traditional masks, prevent humidity, reduce heat and carbon dioxide build-up inside the mask.
The valve is basically a ‘one-way valve’ that only protects the person wearing it and doesn’t filter the aerosols coming out. Hence, an asymptomatic carrier of the novel coronavirus can easily spread the infection to others when the valve releases the unfiltered exhaled air in the immediate surroundings.
