The fact remains that masks are terrible to wear unless you've got a two-can, two-way respirator. I've got my painting respirator, and it's got two cans for inhaling, does an amazing job in the booth with spray lacquer -- which tells me how good those filters really are.
But I still haven't seen two way or "exhale" cans anywhere.
Anyone who does anything physical with just a sheet of "filter" doesn't last long. Even just sitting, they're ridiculous. I'm always pulling the cloth away for a fast inhale of actual oxygen. Oh, but that's "handstoface" and a no no no.....
Up hills slow, Down hills fast Tonnage first and Safety last.
