The iRobot Roomba Plus 405 Combo takes the iRobot Filter 3-Pack (Roomba Plus 405 & 505 Combo) (part 4849900) as its filter; replace it every 3 months; Australian sellers list it from A$40.77 as of 26 October 2026. Fitment confirmed against the manufacturer's compatibility list.
Your robot vacuum
iRobot Roomba Plus 405 Combo
Robot vacuum
Confirmed against iRobot's listConfirmed against iRobot's own compatibility list
Not yours? ChangeSave it · remind me every 3 months
Takes the 4849900 filter
Filter 3-Pack (Roomba Plus 405 & 505 Combo) · replace every 3 months · check the code printed on your old filter before ordering.
Your robot vacuum
Robot vacuum
Confirmed against iRobot's listConfirmed against iRobot's own compatibility list
Takes the 4849900
Filter · every 3 months · check the code on your old filter.
Other iRobot robot vacuums that take the 4849900
GenuineGenuine iRobot
$40.77
Amazon AU · 26 OctLowest genuine · Amazon AU · checked 26 Oct
CompatibleCompatible option
See seller
No compatible seller tracked yetNo compatible seller tracked yet
Genuine: made by iRobot. Compatible: another brand.Genuine is made by iRobot. Compatible is made by another brand. Check the seller's page for the size and models it fits.
Lowest price · $40.77
Amazon AU. Every seller we track is listed below. Some links earn us a commission. Some seller links earn us a commission, at no extra cost to you.
Other parts this robot vacuum takes
- iRobot Dirt Disposal Bags 3-Pack (AutoEmpty & AutoWash docks)Open Amazon AU$7.25 each · 4-pack $28.99
The dust bag. Separate from the filter.
Compare 3 sellers - iRobot Multi-Surface Rubber Brush (Roomba Plus 405/505 & 205)Open Amazon AU$36.01
The main brush. Separate from the filter. Replace every 6 months.
- iRobot DualClean Mop Pads 6-Pack (Roomba Plus 405 & 505 Combo)Open Amazon AU$56.29
The mop cloth. Separate from the filter. Replace every 3 months.
Compare 2 sellers - iRobot Edge-Sweeping Brush 3-Pack (Roomba Essential, 105, 205, Plus 405/505, Max 705 Vac)Open Amazon AU$6.74 each · 4-pack $26.97
The side brush. Separate from the filter. Replace every 3 months.
Compare 1 seller
AUD, before delivery. Each price shows when it was checked.
Opens Amazon AU in a new tab. Their page is the source of truth for price, delivery and returns.
Not due yet?
Get a nudge when your filter is due — it's every 3 months. One email two weeks before, no newsletter. Manage or stop it anytime.
How to change the filter in your iRobot Roomba Plus 405 Combo
Watch the guide or follow the steps.
- 1Lift the robot's magnetic top cover off.
- 2Press the dust bin release buttons and lift the bin out.
- 3Remove the old filter (it comes out in its plastic surround) and fit the new one.
- 4Put the bin back and replace the top cover.
Every number this part goes by
- Retail name:
- 4849900
Sellers list any of these; they are the same part.
About your iRobot Roomba Plus 405 Combo
iRobot robot vacuum — Roomba Plus 400 series. Its filter is the Filter 3-Pack (Roomba Plus 405 & 505 Combo), part 4849900, changed every 3 months.
Also in this robot vacuum: iRobot Dirt Disposal Bags 3-Pack (AutoEmpty & AutoWash docks), iRobot Multi-Surface Rubber Brush (Roomba Plus 405/505 & 205) (every 6 months), iRobot DualClean Mop Pads 6-Pack (Roomba Plus 405 & 505 Combo) (every 3 months), iRobot Edge-Sweeping Brush 3-Pack (Roomba Essential, 105, 205, Plus 405/505, Max 705 Vac) (every 3 months).
Where the model number is: 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 3 iRobot models
Common questions
- Which filter fits the iRobot Roomba Plus 405 Combo?
- The iRobot Roomba Plus 405 Combo takes the iRobot Filter 3-Pack (Roomba Plus 405 & 505 Combo) (part 4849900).
- How often should I replace the filter in my iRobot Roomba Plus 405 Combo?
- Every 3 months. It works less well as the filter fills up, so it's worth doing on time.
- Where can I buy the 4849900 in Australia?
- We track 1 Australian seller for the 4849900; the lowest listed price when we last checked was A$40.77 at Amazon AU. Prices are re-checked daily and dated on this page.
- How do I fit the 4849900 in an iRobot Roomba Plus 405 Combo?
- No tools, a few minutes: 4 steps, listed on this page with the replacement video where the maker has one.
- What happens if I don't change it?
- A clogged filter loses suction, worn brushes miss edges, and a stale mop cloth smears rather than cleans.
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