The linked source lists this model. Checked 2026-09-18. Availability and price may change.
Buying guidance for 5510
Do the Winix 5510 and C909 use the same filters?
No. Winix specifies Filter Q (1712-0123-00) for the 5510 and Filter A (115115) for the C909. Choose the part listed for your exact model; the shared Winix brand does not make these filter sets interchangeable.
What should I compare in a Filter Q package?
Filter Q includes HEPA and AOC carbon components. Winix recommends replacing both about every 12 months. Confirm that the selected offer includes both components.