These filters work well but I wish they weren't so expensive. I don't change them every month, but sometimes I vacuum them so they can be used longer. The 3m filter machine is great for cleaning the air and creating white noise. We can't sleep if it's too quiet, so that suits us. We set it to medium and that's just the right amount of noise. Although taller than many room air filters, I find it takes up less space than shorter round filters.
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