Which models fit HAC-504 / Filter A?

HAC-504 / Filter A is currently listed for HCM350.

Is HAC-504 / Filter A universal?

No. Replacement filters, bags, cartridges, and maintenance kits should be matched by exact device model and part family, not by shape alone.

Humidifier wicking filter compatibility

HAC-504 / Filter A Compatible Models

Name: Honeywell HAC-504 Humidifier Replacement Filter A
Brand: Honeywell
SKU: HAC-504 / Filter A

Honeywell HAC-504 Humidifier Replacement Filter A

HoneywellHoneywellBrandBrand

OEMOEMStatusStatus

2 moReplace every 1-2 months during heavy use or when mineral buildup appearsIntervalReplacement interval

Compatible devices

HCM350

Honeywell HCM350 Cool Moisture Humidifier

Confidence: 92%

Before you buy this replacement

Confirm your exact device model, not only the product family.
Compare the old part number against HAC-504 / Filter A.
Check whether the listing includes the full kit or only one filter piece.

Not a universal part

HAC-504 / Filter A should be matched to listed models and official part references. Similar-looking replacements can differ by seal, frame, cartridge latch, chip requirement, bag type, or pack contents.

Risk note: HAC-504 is often called Filter A. Do not confuse it with Honeywell HEPA air purifier filters or mineral cartridges.

Compare similar replacements

HAC-504 / Filter A vs 35 Water Panel

Honeywell HAC-504 and AprilAire 35 are both humidifier evaporative media, but they fit completely different humidifier types.

Source-backed compatibility

4 public source signals checked. FitCheckr weighs official pages, manuals, support docs, retailer listings, and public discussion summaries before showing a fit verdict.

Data sources Methodology Report an issue

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