Review on 🔍 Fette Filter 2-Pack of High-Quality HEPA Filters with 8 Carbon Replacement Filters – Compatible with Winix Filter A 115115, Size 21 – Plasma Wave Air Purifier 5300, 6300, 5300-2, 6300-2, P300, C535, AM90 by Stephen Schmidt

They are excellent and a perfect match for our Winix C535. I just wish I could remember the C535 uses 2 hepa filters so technically I should have bought 2 sets instead of 1. Still a good deal considering even at Costco where they discount the OEM version of this Winix branded filter they charge $90 each. the same and I really see no difference. This is a quality filter, just like the original filter that I threw away years later. We will order another one for our second C535.