What Filter Fits the ResMed AirSense 11? Replacement Guide
A clean filter is one of the simplest things that keeps your CPAP running well, and one of the most commonly forgotten. If you own a ResMed AirSense 11, here is exactly which filter it uses, why it differs from older ResMed machines, and how often to change it.
Which Filter the ResMed AirSense 11 Uses
The ResMed AirSense 11 uses its own AirSense 11 specific filter. It is not the same filter as the AirSense 10 or the older S9, and the filters are not interchangeable between these machines. Always order the filter made for the AirSense 11.
Why AirSense 11 Filters Are Different From AirSense 10
ResMed redesigned the filter housing on the AirSense 11, so filters shaped for the AirSense 10 or S9 will not seat correctly. Using the wrong filter, or forcing one that does not fit, can let unfiltered air into the machine and reduce how well it works. This is the single most common mistake when people reorder filters for a newer machine.
If you are not sure which machine you have, the model name is printed on the device itself.
Standard vs Hypoallergenic AirSense 11 Filters
The AirSense 11 uses two filter options, and many users keep a mix on hand:
- Standard disposable filter. The everyday filter. A light, single use filter that captures larger particles. Typically replaced about every two to four weeks.
- Hypoallergenic filter. A finer filter that captures smaller particles such as fine dust and some allergens. Often replaced about every one to two months.
Both are disposable and not washable. Rinsing a disposable filter damages it and reduces its effectiveness, so these are replaced rather than cleaned.
How Often to Replace Your AirSense 11 Filter
As a general guideline:
- Standard filter: every 2 to 4 weeks
- Hypoallergenic filter: every 1 to 2 months
- Replace sooner if you live in a dusty home, have pets, or notice the filter looks gray or discolored
Homes with more dust or pet dander often go through filters faster, so checking monthly is a good habit.
Signs It Is Time to Change Your CPAP Filter
- The filter looks gray, dusty, or discolored instead of clean white
- More dust around the machine's air intake
- The machine seems to be working harder or sounding different
- It has simply been longer than your replacement interval
Where to Order Genuine AirSense 11 Filters
MyCPAPZone stocks genuine ResMed AirSense 11 filters, both standard and hypoallergenic, with fast nationwide US shipping. Filters are a replacement part and do not require a prescription, so you can restock anytime and keep a few spares on hand.
Shop genuine AirSense 11 filters here.
Frequently Asked Questions
Are AirSense 10 and AirSense 11 filters the same?
No. The AirSense 11 uses a different filter that is not interchangeable with the AirSense 10 or S9. Order the filter made specifically for your machine.
Can I wash and reuse my AirSense 11 filter?
No. The standard and hypoallergenic filters are disposable and not washable. Rinsing damages them, as they are designed to be replaced, not cleaned.
How often should I change my CPAP filter?
Standard filters are typically replaced every 2 to 4 weeks and hypoallergenic filters every 1 to 2 months, or sooner in dusty homes or homes with pets.
Do I need a prescription to buy CPAP filters?
No. Filters, cushions, tubing, and other replacement parts are available without a prescription in the US.
What happens if I do not change my filter?
A clogged filter lets less clean air through and can make the machine work harder. Changing it on schedule keeps your therapy air clean and your machine running smoothly.