Do I really need an H14 filter for my air purifier?

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H13

thanks for the video, you explained it very well

sadly, that didn't really answer anything. you could've gone into air pressure and how needing a faster fan leads to more noise etc.

I'm sorry but using rocks to do this test? I'm offended a biotechnologist. HEPA filters are tested under strict lab conditions. Yes, in general use, h12 and 14 won't make a huge difference.
But please don't explain this point using 'stones' and other irrelevant data. It's misleading.

Hi. I have searched every where and it seems most manufacturers don't give the H rating. You don't say it either. What is the rating for Stadler Form Roger purifier? Is it 12 or 14?