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Honeywell · humidifier filter

Honeywell Filter A (HAC-504)

Honeywell HAC-504 Humidifier Replacement Filter A. Part HAC-504. Replace every 30 to 60 days depending on water quality and usage. Fits 32 models and their listed variants.

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

Fits these models

Part numbers

Genuine part
HAC-504
Also listed as
HAC504AW, HAC504PF1V2, HAC-504AW
Packs
HAC504PF3V2 (3-pack)
How often
Replace every 30 to 60 days depending on water quality and usage
What is in it
blue pre-filter layer; wicking filter (Protec antimicrobial treated)
Size
3.75 x 5.75 x 9.25 in.

Sources

  • 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 many honeywellstore.com Maker's own page checked Oct 1, 2026
    Page for the HCM-315T (per its URL): 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.'
  • Model variants honeywellstore.com Brand's licensed store checked Oct 1, 2026
    'HCM-300 Series: HCM-300T, HCM-305T, HCM-310T, HCM-315T, HCM-350, HCM-350B'
  • 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
Show all 27 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
    'Honeywell HAC-504 Humidifier Replacement Filter A'; MPN HAC504PF1V2
  7. 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'
  8. honeywellstore.com Brand's licensed store checked Oct 1, 2026
    'HAC-504 and HAC-504AW are Filter A.'
  9. honeywellstore.com Brand's licensed store checked Oct 1, 2026
    'Fits Honeywell Humidifier Models: Also fits: Enviracaire Model: ECM-250i'
  10. 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' ... 'Compatible with Humidifier Models: ... HCM305TCST (HCM-305T-CST) Humidifier'
  11. honeywellstore.com Brand's licensed store checked Oct 1, 2026
    'Honeywell HAC-504 Humidifier Replacement Filter A'; part numbers HAC-504, HAC504AW, HAC504PF1V2
  12. honeywellstore.com Brand's licensed store checked Oct 1, 2026
    'Fits Honeywell Humidifier Models: HCM-500 Series: HCM-530, HCM-535, HCM-535-20, HCM-540, HCM-550, HCM-550-19, HCM-551, HCM-560'
  13. 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'
  14. 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' ... 'Compatible with Humidifier Models: ... HCM632TG (HCM-632TG) Humidifier'
  15. honeywellstore.com Brand's licensed store checked Oct 1, 2026
    'Fits Honeywell Humidifier Models: HCM-700 Series: HCM-710'
  16. honeywellstore.com Brand's licensed store checked Oct 1, 2026
    'Fits Honeywell Humidifier Models: HCM-1000 Series: HCM-1000, HCM-1000C, HCM-1010'
  17. honeywellstore.com Brand's licensed store checked Oct 1, 2026
    'Fits Honeywell Humidifier Models: HCM-2000 Series: HCM-2000C, HCM-2001, HCM-2002, HCM-2020, HCM-2050; compatible list also HCM2000 (HCM-2000), HCM2051 (HCM-2051), HCM2052 (HCM-2052)'
  18. honeywellstore.com Brand's licensed store checked Oct 1, 2026
    'Fits Honeywell Humidifier Models: HEV-300 Series: HEV-312, HEV-355'

How many

  1. honeywellstore.com Maker's own page checked Oct 1, 2026
    Page for the HCM-315T (per its URL): 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
    Page for the HCM-350 (per its URL): p4 'CHANGING FILTER Filter HAC-504AW ... Remove and discard used filter. Soak new filter in cool water.'
  3. honeywellstore.com Maker's own page checked Oct 1, 2026
    Page for the HEV312 (per its URL): p3 'Remove filter holding basket and discard old filter.'
  4. honeywellstore.com Maker's own page checked Oct 1, 2026
    Page for the HEV355 (per its URL): p3 'Remove and discard used filter. Soak new filter in cool water.'

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.'

Model variants

  1. honeywellstore.com Brand's licensed store checked Oct 1, 2026
    'HCM-300 Series: HCM-300T, HCM-305T, HCM-310T, HCM-315T, HCM-350, HCM-350B'

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