
These filters fit my Holmes air purifier exactly and have worked great for about a year. When they're not as effective as they should be, the red light on my air purifier comes on, and then it's time to order more. My Holmes air purifier was one of my best purchases of all time. When I realized I needed it, the microbiologist told me to buy this. She was right. There are so many different air purifiers on the market that when I was battling pneumonia for 7 months it was very overwhelming. I couldn't stand ionic cleansers. Please I don't care what brand you choose, you need to make sure you are buying a HEPA purifier and using the correct filters for that brand. By the way, I haven't been sick for 4.5 years.

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