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Pre-filter and odor reduction layer

Honeywell Filter K Gas & Odor Reducing Pre-Filter (2-Pack) HRF-K2 replacement filter

Filter K Gas & Odor Reducing Pre-Filter (2-Pack) (part HRF-K2) fits Honeywell HFD-120, Honeywell HFD-300, Honeywell HFD-310 and 6 more models, according to the official Honeywell product page.

Official Honeywell fit · checked

Honeywell models that use Filter K Gas & Odor Reducing Pre-Filter (2-Pack) HRF-K2

This filter is listed for 9 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 K Gas & Odor Reducing Pre-Filter (2-Pack) HRF-K2

Before you order

What to check in a HRF-K2 listing

  • The listing names part HRF-K2. Similar-looking filters are not proof of fit.
  • Your purifier is one of the compatible models: Honeywell HFD-120, Honeywell HFD-300, Honeywell HFD-310 and 6 more models.
  • 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 sells HRF-K2 as a 2-pack pre-filter set: replace Filter K pre-filters every 3 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 K Gas & Odor Reducing Pre-Filter (2-Pack) filter set HRF-K2

The calendar reminder starts 3 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 K Gas & Odor Reducing Pre-Filter (2-Pack) (HRF-K2)?

Honeywell sells HRF-K2 as a 2-pack pre-filter set: replace Filter K pre-filters every 3 months.

Which Honeywell models use the Filter K Gas & Odor Reducing Pre-Filter (2-Pack) HRF-K2?

According to the official Honeywell product page, Filter K Gas & Odor Reducing Pre-Filter (2-Pack) (HRF-K2) fits Honeywell HFD-120, Honeywell HFD-300, Honeywell HFD-310 and 6 more models. Verify the model label on your unit before ordering.

Do aftermarket HRF-K2 filters work?

Marketplace listings may be from the manufacturer or a third party. Match the exact part number HRF-K2, 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 HRF-K2 for HFD-120, HFD123, HFD140, HFD230, HFD280, HFD-300, HFD-310, HFD-320, and HFD360.

Honeywell Plugged In Filter K 2-Pack Page

Source compatibility checked 2026-08-29. Recheck the listing and your purifier label before ordering.