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What filter does a Honeywell HCM-350B take?
It takes the Honeywell HAC-504 Filter A — OEM part number HAC-504.
Honeywell HCM-350B, evaporative humidifier, tabletop, sold in black, 1.0-gallon tank.
Lowest verified price: $16.95 — 1 filter, genuine Honeywell HAC504PF1 at Honeywell Consumer Store (honeywellconsumerstore.com). Shipping calculated at checkout on the Honeywell store. Checked 2026-11-11.
Buy the HAC-504 on Amazon — HAC-504Amazon search for the exact part number (no single listing is endorsed). Amazon price is shown on Amazon; we do not quote it here.
The part, in brief
| Part | Honeywell HAC-504 Filter A |
|---|---|
| Replacement interval | Honeywell: replace every 30–60 days depending on water quality and usage (honeywellconsumerstore.com). FiltersFast spec: filter life 2 months. |
| Per change | One filter per change. |
| Equivalents | BestAir HW500, Filters Fast HW500 R, DiscountFilters (AIRx) AXPPF-HW500AM, Protec (Kaz) WF2 |
Verified prices
| Option | Price | Store & shipping |
|---|---|---|
| Genuine (OEM) 1 filter, genuine Honeywell HAC504PF1 | $16.95 | Honeywell Consumer Store (honeywellconsumerstore.com) Shipping calculated at checkout on the Honeywell store · Checked 2026-11-11 · source |
| Aftermarket 3-pack, Filters Fast HW500 R ($7.66 per filter) | $22.99 | FiltersFast Free economy shipping on orders $99+ (lower 48); a fee applies below that · Checked 2026-11-11 · source |
| Also checked 2-pack AIRx replacement | $28.99 | DiscountFilters Free shipping on orders $70+ at DiscountFilters; a fee applies below that · Checked 2026-11-11 · source |
| Genuine (OEM) 1 filter, genuine Honeywell HAC504PF1V2 | $17.99 | Ace Hardware Ace store price; delivery terms at checkout · Checked 2026-11-11 · source |
Full record with every price, source and date: Honeywell HAC-504 Filter A page.
Finding the model number on a Honeywell
Model numbers are on the bottom of the base or on a sticker on the back of the tower. The letter at the end is the color: B = black, W = white (for example HEV615B is the black tower, HEV615W the white one). Filter letters: A = HAC-504, T = HFT600, R = HAC-504AW-class refill.