What filter does a Hunter 31913 take?
It takes the Duracraft AC-818 / AC-819 Wick — OEM part number AC-818.
Hunter 31913, evaporative humidifier, tabletop.
Lowest verified price: $49.95 — aftermarket, 6-pack replacement ($8.33 per wick; 3-pack $32.95 also listed) at DiscountFilters. Free shipping on orders $70+ at DiscountFilters; a fee applies below that. Checked 2026-11-11.
Buy the AC-818 on Amazon — AC-818Amazon 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 Amazon price is shown on Amazon; we do not quote it here.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 | Duracraft AC-818 / AC-819 Wick |
|---|---|
| Replacement interval | Replace at least once per humidification season (DiscountFilters family wording). |
| Per change | One wick per change on the models listed. |
| Equivalents | BestAir D18-C, Accumulair UFD19C |
Verified prices
| Option | Price | Store & shipping |
|---|---|---|
| Aftermarket 6-pack replacement ($8.33 per wick; 3-pack $32.95 also listed) | $49.95 | DiscountFilters Free shipping on orders $70+ at DiscountFilters; a fee applies below that · Checked 2026-11-11 · source |
No genuine Duracraft-branded price was verified — aftermarket only, labeled as such.
Full record with every price, source and date: Duracraft AC-818 / AC-819 Wick page.
Finding the model number on a Hunter
Hunter humidifier model numbers are on the bottom label. Hunter left the humidifier business; parts remain available through parts retailers. Care-Free models use a permanent PermaWick instead of a replaceable wick.