Primary replacement filter set
Honeywell Filter O 3-in-1 HEPA Replacement Filter HRFO1 replacement filter
Filter O 3-in-1 HEPA Replacement Filter HRFO1 fits Honeywell HPA120 and Honeywell HPA125 according to the cited Honeywell source.
HRFO1
Check official Honeywell availability
Non-affiliate link to the cited official product page.
Quick fit check
Filter O 3-in-1 HEPA Replacement Filter fit and replacement facts
Honeywell recommends replacing 3-in-1 Filter O HEPA filters every 9 to 12 months.
Cited package contents
Package details below come from the linked official source; recheck it before buying.
Filter O 3-in-1 HEPA Replacement Filter HRFO1
- 1 × 3-in-1 HEPA Filter O element Replaceable Official source checked
Compatible Honeywell models
Follow a model link for its complete primary, optional, specialty, and alternative filter list.
| Model | Filter | Part number | Role | Source | Marketplace |
|---|---|---|---|---|---|
| Honeywell HPA120 | Filter O 3-in-1 HEPA Replacement Filter | HRFO1 |
Primary replacement filter set | Honeywell Plugged In Filter O Page | Check prices |
| Honeywell HPA125 | Filter O 3-in-1 HEPA Replacement Filter | HRFO1 |
Primary replacement filter set | Honeywell Plugged In Filter O Page | Check prices |
Buying checklist
What to check in a filter listing
Confirm that the listing names part HRFO1 and one of the compatible models: Honeywell HPA120 and Honeywell HPA125. Similar-looking filters are not proof of fit.
Decide whether you want an OEM or aftermarket filter, then compare the included pieces, product photos, seller details, delivery estimate, and total price.
Care guidance
Replacement schedule
Honeywell recommends replacing 3-in-1 Filter O HEPA filters every 9 to 12 months.
Usage conditions can affect service life. Follow the cited manufacturer guidance for this part.
Optional calendar tool
Plan your next filter change
Choose a date to download a calendar reminder based on the cited replacement guidance.
Your date is processed only in this browser. The .ics calendar file is generated locally on your device and is not uploaded to this site.
Frequently asked questions
How often should I replace the Honeywell Filter O 3-in-1 HEPA Replacement Filter (HRFO1)?
Honeywell recommends replacing 3-in-1 Filter O HEPA filters every 9 to 12 months.
Which Honeywell models use the Filter O 3-in-1 HEPA Replacement Filter HRFO1?
According to the official Honeywell product page, Filter O 3-in-1 HEPA Replacement Filter (HRFO1) fits Honeywell HPA120 and Honeywell HPA125. Verify the model label on your unit before ordering.
Do aftermarket HRFO1 filters work?
Marketplace listings may be from the manufacturer or a third party. Match the exact part number HRFO1, review the listing details, and verify the model label on your unit before buying.
Manufacturer source
The official Honeywell Plugged In Compatible with field lists HRFO1 for HPA120 and HPA125 Allergen Plus Tabletop Air Purifier models.
Honeywell Plugged In Filter O Page
Source compatibility checked 2026-08-29. Recheck the listing and your purifier label before ordering.