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Jun 28, 2010 · For the cloth masks, monodisperse aerosol penetration levels (35–68%) for 20 nm size particles increased steadily, reached maximum (73–82%) at 100 nm range, plateaued up to 400 nm, and increased slightly up to 1000 nm at 5.5 cm s −1 face velocity ( Fig. 4a ). Cited by:25