[daniel1212]

Here is where that maks fails - in the fitting. If the mask does not provide a solid SEAL against the face, air moves in around the mask.

The article it deals with that.

This is where I see an opportunity and I am using my 3d printer to develop a mask that is low cost (target $30 to $35), that provides HEPA 13 or better filtration,

What about the Tyvek used in shopping bags? It is barely breathable, so you need forced air to use it, but it would be cheap.

[WVNan]

I see that after 8 posts real Americans have already started to “invent” ways to “make” something to solve a problem. Now if we could just get the Government to get out of the way......