Description
Quick answer: This is the genuine ResMed Air11 DC/DC converter (part 39231) — it powers an AirSense 11 or AirCurve 11 machine directly from a 12V or 24V DC source (a car, boat, RV, or compatible external battery), plugging into the vehicle’s auxiliary/cigarette-lighter socket. It provides enough power to run both the machine and the heated humidifier + ClimateLineAir tubing at once, so you keep full-featured therapy on the go — no need to switch off humidification. Note: it’s specific to the Air11 series (not Air10), and only the genuine ResMed converter should be used. Machine and DC source not included.
What’s included
- 1 × ResMed Air11 DC/DC converter (90W, part 39231)
AirSense 11 / AirCurve 11 machine and DC power source not included.
About this part
The Air11 machines normally run on AC mains, but this DC/DC converter lets you run one from a 12V or 24V DC source instead — ideal for travel, camping, RVs, boats, off-grid use, and power outages. It plugs into a vehicle’s auxiliary/cigarette-lighter socket (or a compatible external battery) and converts that DC power to what the machine needs.
- Full-featured therapy on DC — it supplies enough power to run both the device and the HumidAir heated humidifier and ClimateLineAir heated tubing simultaneously, so you don’t have to disable humidification when off mains.
- 12V or 24V input — works with common vehicle and battery sources; it also refines existing 24V DC to protect the machine’s sensitive electronics.
- Backup or travel power — a convenient alternative to a dedicated travel battery, or a fallback during outages.
- Low-battery indicator — an amber light warns when the source battery is getting too low to run the device.
Air11-specific — important: this converter is for the AirSense 11 and AirCurve 11 series only. It is not interchangeable with the Air10 DC/DC converter (37297), and vice versa. Using a non-ResMed converter with an Air11 is not validated and can risk the machine — use the genuine Air11 converter.
Key features
- Genuine ResMed Air11 DC/DC converter (39231) — for AirSense 11 / AirCurve 11.
- Runs the machine from 12V/24V DC — car, boat, RV, external battery.
- Powers the humidifier + heated tubing too — full therapy, no need to disable humidification.
- Protects the electronics — refines 24V DC input; low-battery indicator.
- Air11-specific — not the Air10 converter (37297); use genuine only.
Specifications
| Specification | Detail |
|---|---|
| Product type | DC/DC power converter (runs device from DC) |
| Compatible devices | ResMed AirSense 11 and AirCurve 11 series |
| Input | 12V–24V DC (vehicle auxiliary/cigarette-lighter socket, or compatible battery) |
| Output | 24V (≈65–90W) — runs device + humidifier + heated tubing |
| Connection | Vehicle auxiliary/accessory socket |
| Indicator | Low-battery (amber) light |
| Included | Converter only |
| Not included | Machine, DC source |
| Not interchangeable | Air10 DC/DC converter (37297) — different part |
| Genuine only | Non-ResMed converters not validated; can risk the device |
| HCPCS | E1399 |
| UPC | 619498392315 |
| Prescription | Not required |
| ResMed reference / SKU | 39231 |
| Brand | ResMed |
Frequently asked questions
What does it do?
It lets you power an AirSense 11 or AirCurve 11 from a 12V or 24V DC source (car, boat, RV, external battery) via the vehicle’s auxiliary socket — including running the humidifier and heated tubing.
Which machines does it work with?
The ResMed AirSense 11 and AirCurve 11 series only.
Will it run my humidifier too?
Yes — it supplies enough power to run the machine and the HumidAir humidifier and ClimateLineAir heated tubing at the same time, so you don’t have to turn off humidification.
Is it the same as the Air10 converter?
No — the Air11 converter (39231) is not interchangeable with the Air10 converter (37297). Order the one that matches your machine.
Can I use a cheaper non-ResMed converter?
It’s not recommended — non-ResMed converters aren’t validated for the Air11 and can risk the machine. Use the genuine Air11 converter.
Is this a battery?
No — it’s a converter, not a battery. It draws power from a DC source (like a car socket or external battery); you supply the DC source.
Do I need a prescription?
No — this accessory does not require a prescription.
Can I get it delivered in Brooklyn or shipped nationwide?
Yes — Stark Medical Supplies offers local pickup and delivery in Brooklyn and across NYC, plus USPS shipping throughout the continental U.S.
Use only with a compatible ResMed Air11 device according to the converter and device user guides.
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