I have a ventilator from Home Depot or somewhere. I do not know what it is rated, but it should do something--especially socially, since I have not seen anyone wear anything besides a mask or bandana.
Supposedly these links state that there is no known risk from fiberglass inhalation, although it does not sound like a great idea:
https://monographs.iarc.fr/list-of-classifications/
https://monographs.iarc.fr/agents-cl...d-by-the-iarc/