Exact model stated by the manufacturer

WINIX AT40 replacement filter

Documented OEM reference: AT40 360° All-in-One True HEPA Filter Set

WINIX's official AT40 product page names the exact AT40 model and states that the unit includes two 360° All-in-One True HEPA filter sets and a filter replacement indicator.

Limits. US-source model/filter evidence; the page does not expose a separate replacement-filter SKU. Verify the full purifier label and the replacement filter packaging before ordering.

WINIX official AT40 product page · US ↗

Source market: US · Checked 2026-10-23. No stock, price, or seller claim is made. Fit is not filtration performance.

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Use this text to cite the page. The last-updated date is the date of the latest change to its content.

Filter Ledger. “US WINIX AT40 Replacement Filter”. https://filters.toolatlas.app/en-us/filters/winix-at40/. Last updated October 23, 2026.