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To address the filtration performance of common fabric materials against nano-size particles including viruses, five major categories of fabric materials including sweatshirts, T-shirts, towels, scarves, and cloth masks were tested for polydisperse and monodisperse aerosols (20-1000 nm) at two different face velocities (5.5 and 16.5 cm s-1) and Coronavirus:Why face masks are not very effective for Cao Jun, general manager for mask manufacturer Lanhine in China, told Reuters on January 23 that demand had already reached 200 million masks per day. Lanhine's normal production rate is 400,000
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