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Honeywell · air purifier

Honeywell HFD-310 replacement filter

Use part HRF-K2. Replace each filter every 3 months.

The filter that fits

From the maker's archived page

Honeywell Pre-filter K

Honeywell Household Odor and Gas Reducing Pre-Filter K

Part number
HRF-K2also sold as HRFK2V2
How many
1 per unit
How often
Replace each filter every 3 months
Size
20.0 x 6 x 0.25 in

The main ifD filter in this purifier is permanent and washable; Pre-filter K is the only replaceable filter, an odor pre-filter used in place of the washable foam pre-filter. HRF-K2 is a 2-pack.

Buy Pre-filter K on Amazon

Opens an Amazon search for Honeywell Pre-filter K HRF-K2. Check the listing says HRF-K2.

See the sources

Does your exact model share this filter?

Honeywell labels several versions of the HFD-310. Check the label on your unit.

  • HFD-310 takes HRF-K2
  • HFD-300 same filter · Air Genius 3; same Pre-filter K
  • HFD-320 same filter · Air Genius 5; same Pre-filter K

Look-alike models that take a different filter

The compact HFD280 is also sold as 'Air Genius 4' and takes the same Pre-filter K.

Sources

Medium confidence: from an archived manufacturer page, a licensed brand store, or a live manufacturer page that names a sibling variant rather than this exact model. Each line is the page we read and the day we read it.

  • Which filter fits web.archive.org Maker's archived page checked Oct 1, 2026
    SKU: HRF-K2 ... Compatible with: HFD-120 / HFD123 / HFD140 / HFD230 / HFD280 / HFD-300 / HFD-310 / HFD-320 / HFD360 ... In the Box: 2 K Pre-Filters (archive.org copy of 2025-01-23)
  • How many honeywellstore.com Brand's licensed store checked Oct 1, 2026
    Owner's manual HFD30X/HFD31X/HFD32X series, p. 3: 'Please only use one pre-filter in your air purifier at a time ... the Permanent, Washable Pre-Filter or the replaceable Odor & VOC Reducing K Pre-Filter'
  • How often web.archive.org Maker's archived page checked Oct 1, 2026
    use only Genuine Honeywell air purifier filters, and replace each filter every 3 months
  • What's in it honeywellstore.com Brand's licensed store checked Oct 1, 2026
    The K Pre-Filters deodorize the air, reducing odors with potassium permanganate calcite
  • About the brand honeywellstore.com Brand's licensed store checked Oct 1, 2026
    HoneywellStore.com ... under license by Honeywell International Inc.
Show all 8 sources

Which filter fits

  1. web.archive.org Maker's archived page checked Oct 1, 2026
    SKU: HRF-K2 ... Compatible with: HFD-120 / HFD123 / HFD140 / HFD230 / HFD280 / HFD-300 / HFD-310 / HFD-320 / HFD360 ... In the Box: 2 K Pre-Filters (archive.org copy of 2025-01-23)
  2. honeywellstore.com Brand's licensed store checked Oct 1, 2026
    HFD300 (HFD-300) Air Purifier; HFD310 (HFD-310) Air Purifier; HFD320 (HFD-320) Air Purifier
  3. honeywellstore.com Brand's licensed store checked Oct 1, 2026
    The HFD-120-Q uses Replacement Pre-filter K ... Requires 1 K Pre-filter ... HRF-K2 (2 pack)

How many

  1. honeywellstore.com Brand's licensed store checked Oct 1, 2026
    Owner's manual HFD30X/HFD31X/HFD32X series, p. 3: 'Please only use one pre-filter in your air purifier at a time ... the Permanent, Washable Pre-Filter or the replaceable Odor & VOC Reducing K Pre-Filter'

How often

  1. web.archive.org Maker's archived page checked Oct 1, 2026
    use only Genuine Honeywell air purifier filters, and replace each filter every 3 months
  2. honeywellstore.com Brand's licensed store checked Oct 1, 2026
    p. 3: 'The K Pre-Filter cannot be washed and should be replaced every 3 months'

What's in it

  1. honeywellstore.com Brand's licensed store checked Oct 1, 2026
    The K Pre-Filters deodorize the air, reducing odors with potassium permanganate calcite

About the brand

  1. honeywellstore.com Brand's licensed store checked Oct 1, 2026
    HoneywellStore.com ... under license by Honeywell International Inc.