What filter does a Lasko 9930 take?
It takes the Lasko THF8 Wick (Natural Cascade) — OEM part number THF8.
Lasko 9930, evaporative humidifier, tabletop, sold as the Natural Cascade.
Lowest verified price: $9.99 — aftermarket, 1 wick, BestAir L8 at Ace Hardware. Ace store price; delivery terms at checkout. Checked 2026-11-11.
Buy the THF8 on Amazon — THF8Amazon 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 Amazon price is shown on Amazon; we do not quote it here.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 | Lasko THF8 Wick (Natural Cascade) |
|---|---|
| Replacement interval | Replace every 1–2 months in season (general wick guidance). |
| Per change | One wick per change. |
| Equivalents | BestAir L8 / L8-C, HQRP THF8 replacement |
Verified prices
| Option | Price | Store & shipping |
|---|---|---|
| Aftermarket 1 wick, BestAir L8 | $9.99 | Ace Hardware Ace store price; delivery terms at checkout · Checked 2026-11-11 · source |
Full record with every price, source and date: Lasko THF8 Wick (Natural Cascade) page.
Finding the model number on a Lasko
Model numbers are on the bottom label. The Natural Cascade 1128/1129/9930 take the THF8 wick (BestAir L8 is the standard retail equivalent).