Received these as a replacement, very hard to find HEPA filters for the air purifier. They are MERV-13 rated and have a 75% filtration rate (MERV 15 is almost 100% but hard to find) so not as good as real HEPA but good enough for my mild asthma. I was able to cut them in half and they fit my Sharp KC850-U air purifier perfectly. The bad rating is because they arrived crumpled on one end like someone dropped something heavy on them. The shipping box was fine, so someone wrapped them that way. Normally I would return them but with local cases of COVID-19 I decided I didn't want to wait.
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