For a filter for the masks I am making I am using the inner lining inside my vacuum bag. Once sewn into the mask it can gently be hand washed but not ironed nor put into dryer…I learn the iron will melt it. This lining keeps out dust and allergens. A Hepa filter fabric would be the best but I don’t have any. Ann Welch
Saw the how to make masks from HEPA vacuum bags. They cost $15 for two. I don’t have the dinero for that at this point.
Youtube said to use 3 layers of fabric or light weight interfacing. I used all my interfacing and am now using 3 layers of fabric.
Barbara B