The ResMed AirSense 11 AutoSet takes the ResMed AirSense 11 (Air11) standard air filter (part 39301) as its filter; replace it every 6 months; Australian sellers list it from A$0.80 each as of 28 October 2026. Fitment confirmed against the manufacturer's compatibility list.
Your CPAP machine
ResMed AirSense 11 AutoSet
CPAP machine
Confirmed against ResMed's listConfirmed against ResMed's own compatibility list
Not yours? ChangeSave it · remind me every 6 months
Takes the 39301 filter
AirSense 11 (Air11) standard air filter · replace every 6 months · check the code printed on your old filter before ordering.
Your CPAP machine
CPAP machine
Confirmed against ResMed's listConfirmed against ResMed's own compatibility list
Takes the 39301
Filter · every 6 months · check the code on your old filter.
Other ResMed CPAP machines that take the 39301
GenuineGenuine ResMed
$1.78 each
50-pack $89.00
Easy CPAP · 1 NovLowest genuine · Easy CPAP · checked 1 Nov
CompatibleCompatible option
$0.80 each
20-pack $15.99
Amazon AU · 28 OctAmazon AU · checked 28 Oct
Check sellerCheck seller details
Genuine: made by ResMed. Compatible: another brand.Genuine is made by ResMed. Compatible is made by another brand. Check the seller's page for the size and models it fits.
Lowest compatibleLowest compatible price · $0.80 each · 20-pack $15.99
Amazon AU. Compare with genuine below. Some links earn us a commission. Some seller links earn us a commission, at no extra cost to you.
Other parts this CPAP machine takes
- ResMed ClimateLineAir 11 heated tubeOpen Amazon AU$60.34
The tubing. ResMed Australia lists the ClimateLineAir 11 heated tube in the box. Separate from the filter. Replace every 6 months.
Compare 7 sellers - ResMed Standard tubing, 2 m (non-heated)Open The CPAP Clinic$19.00
The tubing. Standard 2 m tube: non-heated, so Climate Control will not run. Separate from the filter. Replace every 6 months.
Compare 5 sellers - ResMed SlimLine tube (non-heated)Open The CPAP Clinic$16.80
The tubing. SlimLine tube: non-heated, so Climate Control will not run. Separate from the filter. Replace every 6 months.
Compare 6 sellers - ResMed HumidAir 11 Cleanable tubOpen CPAP Club$85.00
The water tub. ResMed's ANZ AirSense 11 guide lists the HumidAir 11 Cleanable tub in the box; the Standard tub (39100) also fits. Separate from the filter. Replace every 2½ years.
Compare 6 sellers - ResMed HumidAir 11 Standard tubOpen Amazon AU$42.49
The water tub. HumidAir 11 Standard tub (white grip): fill with distilled water only; ResMed gives it a design life of 6 months. Separate from the filter. Replace every 6 months.
Compare 7 sellers
Compare 14 listings from 6 sellers
AUD, before delivery. Each price shows when it was checked.
Compatible options
1 seller
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 6 months. One email two weeks before, no newsletter. Manage or stop it anytime.
How to change the filter in your ResMed AirSense 11 AutoSet
Watch the guide or follow the steps.
- 1Stop the machine and unplug it; ResMed says not to do maintenance while it is running.
- 2Open the air filter cover and take out the old filter.
- 3Place a new filter onto the air filter cover.
- 4Close the cover. The filter and cover must be fitted at all times.
Every number this part goes by
- Retail name:
- 39300
- Retail name:
- 39301
- Retail name:
- 39302
- Retail name:
- 39303
Sellers list any of these; they are the same part.
About your ResMed AirSense 11 AutoSet
ResMed CPAP machine — AirSense 11. Its filter is the AirSense 11 (Air11) standard air filter, part 39301, changed every 6 months.
Other filters the maker lists for this CPAP machine: ResMed AirSense 11 (Air11) hypoallergenic air filter (every 6 months). Hypoallergenic Air11 filter: the finer alternative to the standard filter; fits the same cover.
Also in this CPAP machine:
- ResMed ClimateLineAir 11 heated tube (every 6 months). ResMed Australia lists the ClimateLineAir 11 heated tube in the box.
- ResMed Standard tubing, 2 m (non-heated) (every 6 months). Standard 2 m tube: non-heated, so Climate Control will not run.
- ResMed SlimLine tube (non-heated) (every 6 months). SlimLine tube: non-heated, so Climate Control will not run.
- ResMed HumidAir 11 Cleanable tub (every 2½ years). ResMed's ANZ AirSense 11 guide lists the HumidAir 11 Cleanable tub in the box; the Standard tub (39100) also fits.
- ResMed HumidAir 11 Standard tub (every 6 months). HumidAir 11 Standard tub (white grip): fill with distilled water only; ResMed gives it a design life of 6 months.
Where the model number is: The model is on the label under the machine and in its settings or information screen. Unplug the machine, and take out the water tub if it has one, before you turn it over.
Fits these 4 ResMed models
Common questions
- Which filter fits the ResMed AirSense 11 AutoSet?
- The ResMed AirSense 11 AutoSet takes the ResMed AirSense 11 (Air11) standard air filter (part 39301). Compatible filters made to the same specification also fit.
- How often should I replace the filter in my ResMed AirSense 11 AutoSet?
- Every 6 months. It works less well as the filter fills up, so it's worth doing on time.
- Where can I buy the 39301 in Australia?
- We track 6 Australian sellers for the 39301; the lowest listed price when we last checked was A$0.80 at Amazon AU. Prices are re-checked daily and dated on this page.
- How do I fit the 39301 in a ResMed AirSense 11 AutoSet?
- 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 blocked filter restricts the air the machine draws in, and a torn one lets dust and pollen through; the manual says when to replace it.
- Is there anything to reset afterwards?
- No reset in ResMed's guide. If your care provider turned on replacement reminders, the machine shows them on screen; ResMed's guide does not say the machine detects a new part.
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