I'm in my second purchase of this filter set and yes it fits my 5510 perfectly! So thankful I found this listing. My bedroom has lost the stale musty smell and I never want to go back.

I bought the 5510 about two months ago. I keep it in my bedroom, and run it all night long while I sleep. Before I bought the machine, I would wake up every morning with plugged up sinuses and coughing up mucus. After having my WINIX 5510 for two months, all of that is gone. I get the best sleep of my life, and I wake up with clear sinuses and no cough.

Love this air filter. Cannot find a replacement filter. I've bought 3 now, and they claim to work with 5520 but they are 3x too big.

Why do you make a air purifier that it's olmost two years old that came out and I purchased this filter and they do not fit the winix 5510 there bigger I don't understand the false advertisements. Please remove that I will defenetly buy a winix air purifier again in my life paid so much and wanted to purchase a replacment and this does not fit the winix 5510 I will trash it as soon as the filter gives up waste of money stay away from this air purifier they do not stand up for there new products

Why is the Washable AOC™ Carbon (12M) filter included here? Why isn’t there an option to purchase the 99.99% True HEPA (12M) filter separately? "it is recommended to change both the True HEPA Filter and WashableΔ AOC™ Carbon Filter once every 12 months." Why not advertise that the Washable AOC™ Carbon (12M) filter should be replaced every 12 months?