I am sharing this article from KSAT.com with you
https://www.ksat.com/news/local/2020/04/16/local-nurse-designs-mask-with-995-filtration-efficiency/?utm_source=twitter&utm_medium=social&utm_campaign=snd&utm_content=ksat12&__vfz=medium%3Dsharebar

( RN exec who made and tested masks using AC filter material. From University Health Systems in San Antonio, TX. On KSAT.com. Her name is Tommye Austin, CEO