FitCheckrCompatibility verdict
Does HAC-504 / Filter A fit HCM350?
Model: HCM350
Part: HAC-504 / Filter A
Fit summary
Honeywell HCM350 owners commonly need the HAC-504 / Filter A wicking filter. Replace sooner if the wick is stiff, discolored, or mineral-loaded.
HAC-504 / Filter A compatibility details for Honeywell HCM350
Compatibility verdict
Yes, this replacement is marked as a confirmed fit.
Compatible model
Honeywell HCM350 · Honeywell HCM350 Cool Moisture Humidifier
OEM status and part number
HAC-504 / Filter A is marked as OEM in the replacement data.
Replacement interval
Replace every 1-2 months during heavy use or when mineral buildup appears
Source confidence explanation
FitCheckr shows this compatibility check with a 92% confidence score based on 4 source signals. Higher confidence means more consistent source evidence, not lab testing.
HAC-504 is often called Filter A. Do not confuse it with Honeywell HEPA air purifier filters or mineral cartridges.
- Marketplace title says universal fit but does not mention HCM350.
- The old part number on your device does not match HAC-504 / Filter A or its known family.
- The listing photo looks close, but the latch, seal, bag type, or frame shape differs.
Does HAC-504 / Filter A fit Honeywell HCM350?
Yes, this replacement is marked as a confirmed fit.
Which model is HAC-504 / Filter A listed for?
HAC-504 / Filter A is shown on FitCheckr for Honeywell HCM350 Cool Moisture Humidifier (HCM350). Always confirm the exact model number on your device before buying.
Is HAC-504 / Filter A an OEM part?
HAC-504 / Filter A is marked as OEM in the current FitCheckr data. Use the official source page when warranty or certification matters.
What should I check before buying?
Check your exact device model, the existing part number, manufacturer instructions, replacement interval, and any latch, seal, chip, bag, cartridge, or frame differences before ordering.
What is this confidence score based on?
4 public source signals are currently reflected in this fit check. FitCheckr combines official pages, manuals, support documents, retailer listings, and public discussion summaries where available.
4 public source signals checked. FitCheckr weighs official pages, manuals, support docs, retailer listings, and public discussion summaries before showing a fit verdict.