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 choosing a replacement.
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 choosing a replacement?
Check your exact device model, the existing part number, manufacturer instructions, replacement interval, and any latch, seal, chip, bag, cartridge, or frame differences.
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.