Filters fit my C545 air purifier. I would like to point out that with a real HEPA filter I couldn't figure out which direction the airflow was going because the arrow doesn't point that way. The official Winix filter for the C545 wrote above how the air should pass, but this one doesn't. I haven't tried charcoal filters yet as I don't need to change them at the moment but I think it will work just as well. I don't think it matters much as it works anyway. Overall it is like the original and cheaper.
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