Afnor does not include nose clips in its documents for the general public. However, you can add a 6-8cm slide at the top in the middle of the mask. Leave a notch and slide a metal wire through it, which can be removed during washing to avoid damaging it. As for the choice of material, I don't have a perfect solution. A twist of frozen food bag might do the trick. If you have another idea, don't hesitate to share it.
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