Measurement of Breath Velocity and Volume on Speaking, and Performance of Local Exhaust System as Prevention Measure of InfectionJun Yoshihara, Toshio Yamanaka, Tomohiro Kobayashi, Narae Choi, Noriaki Kobayashi and Ren ZhangE3S Web of Conf., 396 (2023) 02033DOI: https://doi.org/10.1051/e3sconf/202339602033