HEPA Filters Are Effective Materails for DIY Face Masks ...
Read more: Can HEPA filters actually capture viruses? » That means this H11 HEPA filter was able to filter out at least as much virus-sized particles as N95 masks. From this fact alone, HEPA filters seem like a perfect material to use for masks. However, there’s more to masks than just capturing particles. 2. Are HEPA Filters Breathable?