If they wear a mask they can protect others, even if it isn’t a N95 mask.
He emphasizes that “anyone can figure this out,” and that the “light test” is an easy way to tell how well a material may filter. “HEPA filters, vacuum cleaner bags have done really well. Quilter’s cotton, which has a particularly high thread count, actually provides up to about 80 percent filtration of small particles, and actually performs better than a regular surgical mask,” he said.First, it eventually gets hard to breathe. Second, some things, like household air or furnace filters, could be made of things like fiberglass and other substances that aren’t necessarily safe to breathe.
check out the carbon filter on to add to your home-made masks... not N95 grade but is better than just cloth!