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Originally Posted by Griff
This is interesting. Anybody see a downside?
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Yes. If the paper towel is closest to your mouth, you can breathe in paper towel fibers. You don’t want that in your lungs. Paper towels are not lint free. However, if you have a two layer fabric mask, paper towels are excellent additional filtration material sandwiched between the two layers and I have done this myself. I tried a coffee filter first, but it was too difficult to breathe through. The cloth captures any paper towel lint/fibers.
We know wood dust from woodworking is terrible for your lungs. Paper towel fibers are also bad.
Those blue shop paper towels are a lot better.