Dreame L40s Ultra filter
The Dreame L40s Ultra takes the Dreame Dust Box Filter (L60 Ultra, Matrix10 Ultra, L50 Ultra, L50s, X50 Ultra, L40s) (part DRE-RHF21) as its filter; replace it every 3 months; Australian sellers list it from A$39.95 as of 1 August 2026. Fitment confirmed against the manufacturer's compatibility list.
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Your robot vacuum
Dreame L40s Ultra
Robot vacuum · L series
Takes this filter
Dust Box Filter (L60 Ultra, Matrix10 Ultra, L50 Ultra, L50s, X50 Ultra, L40s)
DRE-RHF21
The right filter for L40s Ultra
Dreame Dust Box Filter (L60 Ultra, Matrix10 Ultra, L50 Ultra, L50s, X50 Ultra, L40s)
- Replace every 3 months
- Fits inside the fridge
- Fits 7 models
The RHF21 dust-box filter for the newer Dreame flagships: L60 Ultra, Matrix10 Ultra, L50 Ultra, L50s, X50 Ultra and the L40s pair. Sold singly.
- Pack
- 1 filter
- Washable
- Yes
- Dreame part
- RHF21
Every number this part goes by
- Retail name:
- RHF21
Where to buy
Every seller we track for this part, cheapest first. Genuine is the manufacturer's own part; compatible is a third-party filter made to fit. Prices are re-checked daily where the seller publishes them. Last checked 1 August 2026.
How long it lasts
Replace every 3 months — the app reminds you.
After fitting: Reset the filter timer under Maintenance in the Dreame app.
Flow slows and taste drops off as the filter fills up. Changing on time is the whole point of the filter.
Not due yet?
This filter is due every 3 months. We'll email you when it's time — free, no spam.
Fitting it
A few minutes, no tools. Watch it done, then follow the steps.
- 1Lift the robot's top lid and pull the dust box out by its handle.
- 2Press the clip on the back of the box and lift the old filter off.
- 3Clip the new filter on with the pleats facing the box, close the box and slide it back until it clicks.
- 4In the Dreame app open Maintenance, tap Filter and choose Reset.
About your Dreame L40s Ultra
Dreame robot vacuum, robot vacuum — L series. Its filter is the Dust Box Filter (L60 Ultra, Matrix10 Ultra, L50 Ultra, L50s, X50 Ultra, L40s), part DRE-RHF21, changed every 3 months.
Also in this robot vacuum: Dreame Dust Bag 3L (Aqua10 / Aqua20, Matrix10 Ultra, L10s Pro Ultra Heat, X40 / X50 / X60 Ultra, L40s, L30 Ultra S, L60 Ultra) (every 2 months), Dreame Mop Pad (L10 / L10s / L20 / L30 / L40 / L40s, X40 / X50 / X60 Ultra, Matrix10 Ultra, D20 Pro Plus) (every 6 months), Dreame Side Brush (Aqua10, X40 Ultra, X50 Ultra, L40s Ultra, L40s Pro Ultra) (every 3 months). Worth replacing together — one job, not two.
Checking the model number: Turn the robot over: the model name and serial are on the label on the underside. The model name is also on the top lid of most robots.
Fits these models
Common questions
- Which filter fits the Dreame L40s Ultra?
- The Dreame L40s Ultra takes the Dreame Dust Box Filter (L60 Ultra, Matrix10 Ultra, L50 Ultra, L50s, X50 Ultra, L40s) (part DRE-RHF21). Compatible filters made to the same specification also fit.
- How often should I replace the filter in my Dreame L40s Ultra?
- Every 3 months. Flow slows and performance drops off as the filter fills up, so it's worth doing on time.
- Where can I buy the DRE-RHF21 in Australia?
- We track 2 Australian sellers for the DRE-RHF21; the lowest listed price when we last checked was A$39.95 at dreame_au. Prices are re-checked daily and dated on this page.
- How do I fit the DRE-RHF21 in a Dreame L40s Ultra?
- No tools, a few minutes: 4 steps, listed on this page with the replacement video where the maker has one.
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