Fits checked Oct 1, 2026 · How we check
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Honeywell · humidifier · portable evaporative

Honeywell HCM-631 replacement filter

Use part HAC-504. Replace every 30 to 60 days depending on water quality and usage.

The filter that fits

From the brand's licensed store

Honeywell Filter A

Honeywell HAC-504 Humidifier Replacement Filter A

Part number
HAC-504also sold as HAC504AW
How many
1 per unitpacks: HAC504PF3V2 (3)
How often
Replace every 30 to 60 days depending on water quality and usage
Size
3.75 x 5.75 x 9.25 in.

Honeywell does not say how many filters this model takes; one is assumed here, so check the old filter before ordering.

Buy Filter A on Amazon

Opens an Amazon search for Honeywell Filter A HAC-504. Check the listing says HAC-504.

See the sources

Look-alike models that take a different filter

Look-alike Honeywell HEV320 and HCM-890 units take Filter C (HC-888), not Filter A.

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 honeywellstore.com Maker's own page checked Oct 1, 2026
    Kaz USA owner's manual (copy hosted on honeywellstore.com), PDF p1 'Model HCM-300T Model HCM-310T Model HCM-315T'; p6 'Uses replacement filter HAC-504 or HAC-504AW ... Remove filter holding basket and discard old filter.'
  • How often honeywellstore.com Brand's licensed store checked Oct 1, 2026
    'Depending on water quality and usage, wicking filters should be replaced every 30-60 days.'
  • Size honeywellstore.com Brand's licensed store checked Oct 1, 2026
    'Product Size (LxWxH): 3.75 x 5.75 x 9.25 in.'
  • What's in it honeywellstore.com Brand's licensed store checked Oct 1, 2026
    'Blue pre-filter layer helps capture large airborne particles ... Protec treated antimicrobial filter'
  • Packs honeywellstore.com Brand's licensed store checked Oct 1, 2026
    'Honeywell Humidifier Replacement Wicking Filter A, 3 Pack' MPN HAC504PF3V2
  • About the brand honeywellstore.com Brand's licensed store checked Oct 1, 2026
    'HoneywellStore.com is operated by eAccess Solutions, Inc., under license by Honeywell International Inc.'
Show all 14 sources

Which filter fits

  1. honeywellstore.com Maker's own page checked Oct 1, 2026
    Kaz USA owner's manual (copy hosted on honeywellstore.com), PDF p1 'Model HCM-300T Model HCM-310T Model HCM-315T'; p6 'Uses replacement filter HAC-504 or HAC-504AW ... Remove filter holding basket and discard old filter.'
  2. honeywellstore.com Maker's own page checked Oct 1, 2026
    Kaz USA owner's manual (copy hosted on honeywellstore.com), PDF p1 'COOL MOISTURE HUMIDIFIER MODEL HEV312 SERIES Replacement Wicking Filter Honeywell HAC-504 Series Filter A'; p3 'Remove filter holding basket and discard old filter.'
  3. honeywellstore.com Maker's own page checked Oct 1, 2026
    Kaz USA owner's manual (copy hosted on honeywellstore.com), PDF p1 'MODEL SERIES HEV355 Replacement Wicking Filter Honeywell HAC-504AW Filter Type A'; p3 'Remove and discard used filter. Soak new filter in cool water.'
  4. honeywellstore.com Maker's own page checked Oct 1, 2026
    Page for the HCM-710 (per its URL): Kaz USA owner's manual (copy hosted on honeywellstore.com), PDF p5 'Use Replacement Wicking Filter HAC-504AW or Filter A ... Remove the wicking filter from the main housing. Discard the old wicking filter.'
  5. honeywellstore.com Maker's own page checked Oct 1, 2026
    Kaz USA owner's manual (copy hosted on honeywellstore.com), PDF p1 'MODEL SERIES HCM-350, HCM-350B AND HCM-350B-CST'; p4 'CHANGING FILTER Filter HAC-504AW ... Remove and discard used filter. Soak new filter in cool water.'
  6. honeywellstore.com Brand's licensed store checked Oct 1, 2026
    'Fits Honeywell Humidifier Models: HCM-600 Series: HCM-630, HCM-631, HCM-632, HCM-635, HCM-640BW, HCM-645, HCM-646, HCM-650'
  7. honeywellstore.com Brand's licensed store checked Oct 1, 2026
    'Honeywell HAC-504 Humidifier Replacement Filter A'; MPN HAC504PF1V2
  8. honeywellstore.com Brand's licensed store checked Oct 1, 2026
    'Fits Honeywell Humidifier Models: HCM-300 Series: HCM-300T, HCM-305T, HCM-310T, HCM-315T, HCM-350, HCM-350B'
  9. honeywellstore.com Brand's licensed store checked Oct 1, 2026
    'HAC-504 and HAC-504AW are Filter A.'

How often

  1. honeywellstore.com Brand's licensed store checked Oct 1, 2026
    'Depending on water quality and usage, wicking filters should be replaced every 30-60 days.'

Size

  1. honeywellstore.com Brand's licensed store checked Oct 1, 2026
    'Product Size (LxWxH): 3.75 x 5.75 x 9.25 in.'

What's in it

  1. honeywellstore.com Brand's licensed store checked Oct 1, 2026
    'Blue pre-filter layer helps capture large airborne particles ... Protec treated antimicrobial filter'

Packs

  1. honeywellstore.com Brand's licensed store checked Oct 1, 2026
    'Honeywell Humidifier Replacement Wicking Filter A, 3 Pack' MPN HAC504PF3V2

About the brand

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