They appear to be the same or better quality than the OEM parts from the manufacturer, which is great. I don't know for sure, it's very difficult to verify that the HEPA filter and pre-filter actually work more, less or as well as the OEM. but they seem to be high quality and a great fit, and certainly improved airflow over the old filter I had which was worn out and dirty (as of course it should be). Also, I found buying official GermGuardian OEM filters, at least through Revain, very conflicting. Sometimes they supply quality replacements regularly and some are rubbish and the pre-filter is just a thin piece of felt (nothing like real regular replacement or the ones here from VEVA) is a bad thing. Rarely do you come across a discount on third-party accessories for a product that often requires the replacement of parts that are, on average, better than the original parts!
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