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Primary replacement filter set

Honeywell Filter O 3-in-1 HEPA Replacement Filter HRFO1 replacement filter

Filter O 3-in-1 HEPA Replacement Filter (part HRFO1) fits Honeywell HPA120 and Honeywell HPA125, according to the official Honeywell product page.

Official Honeywell fit · checked

Honeywell models that use Filter O 3-in-1 HEPA Replacement Filter HRFO1

This filter is listed for 2 models. Open a model to see its complete list of primary, optional, and specialty filters.

Official package contents

What's in the box

From the linked official Honeywell product page. Marketplace packs can differ, so compare before you buy.

Filter O 3-in-1 HEPA Replacement Filter HRFO1

Before you order

What to check in a HRFO1 listing

  • The listing names part HRFO1. Similar-looking filters are not proof of fit.
  • Your purifier is one of the compatible models: Honeywell HPA120 and Honeywell HPA125.
  • The pack size and pieces included match what you need. Genuine and third-party filters can differ.
  • The total price with shipping, seller feedback, and delivery estimate work for you.

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.

Free calendar reminder

Never forget a filter change

Enter the date you installed the filter and we'll make a repeating calendar reminder based on the official replacement schedule.

Filter O 3-in-1 HEPA Replacement Filter filter set HRFO1

The calendar reminder starts 12 months after this date and repeats on that schedule.

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.

Official compatibility record

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.