There has been some concern expressed on the internet that HEPA vacuum bags are a dangerous material ... even thin pieces of fabric can do a decent job of catching large droplets of mucus and ...

It’s not a magic charm—it’s a piece of pleated fabric—and it can catch only what it can touch. “People have gotten used to seeing HEPA ... a Miele vacuum with a knockoff bag installed ...

If you want the gold standard material for homemade masks, scour your closets for a HEPA vacuum bag. Researchers at Cambridge ... even thin pieces of fabric can do a decent job of catching large ...