Let me first say that the quality of the HEPA filters and pre-filters is very high. My only criticism is the packaging. Pre-filters are packed in fours. This makes it difficult to install them on the air purifier. They do not lie flat as being folded tightly in the package will cause them to deform. Shipping in a box the same size as the pre-filter solves this problem. Or roll them up instead. Thank you, I hope this helps your QA department.
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