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What filter does a Lennox HCWB3-17 take?
It takes the Lennox X2660 Evaporator Pad (Aprilaire 35-size) — OEM part number X2660.
Lennox HCWB3-17, whole-house humidifier, whole house.
Lowest verified price: $39.95 — 1 panel, genuine Lennox X2660 at FiltersFast. Free economy shipping on orders $99+ (lower 48); a fee applies below that. Checked 2026-11-11.
Buy the X2660 on Amazon — X2660Amazon 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 Amazon price is shown on Amazon; we do not quote it here.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 | Lennox X2660 Evaporator Pad (Aprilaire 35-size) |
|---|---|
| Replacement interval | Replace annually. |
| Equivalents | AprilAire 35 |
Verified prices
| Option | Price | Store & shipping |
|---|---|---|
| Genuine (OEM) 1 panel, genuine Lennox X2660 | $39.95 | FiltersFast Free economy shipping on orders $99+ (lower 48); a fee applies below that · Checked 2026-11-11 · source |
| Genuine (OEM) 2-pack, genuine Lennox X2660 | $62.99 | DiscountFilters Free shipping on orders $70+ at DiscountFilters; a fee applies below that · Checked 2026-11-11 · source |
No Lennox-specific aftermarket price was captured; the AprilAire #35 record carries the aftermarket prices for this pad size.
Full record with every price, source and date: Lennox X2660 Evaporator Pad (Aprilaire 35-size) page.