It really is one of the quietest units / on the down side the unit seems to alert for a change of filter based on time of use and not on resistance of the filter (DOP).
I bought this Fellowes HEPA air and carbon filters for my Winix 5300 and 5500 Plasmawave air filter. Everything fits perfectly and quality is just like the OEM! This deal was better than what I found on *** com so I quickly placed the order. Highly recommended for quality and pricing!
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