Doubling layers in your DIY mask can help improve the mask’s filtering efficiency. However it will also reduce the breathability of the mask. Check out our full article covering DIY masks and the effect doubling mask layers has: https://smartairfilters.com/blog/best-materials-make-diy-face-mask-virus/
Will Doubling the Layers of Fabric Increase the Efficiency of a DIY Mask?
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