[sudo-discuss] HEPA filter roll and activated carbon filter

Hey all, I'm working on a side project on creating personal filters for the upcoming fire season and am in need of raw HEPA filter material and/or also activated carbon/charcoal material as well. Does anyone know who I could reach out to to find this? Most of it's produced in China but if anyone has any extra lying around or has a friend who works in creating filters please let me know.