M Series Auto CPAP Machine with C-Flex
The M Series Auto is a small and feature packed CPAP that looks more like a stylish clock radio than a CPAP.
It easily packs away in your carry on luggage, and has an incredible number of high-tech features, including the patented C-Flex comfort feature, self-adjusting pressure, and powerful clinical data features, on-board.
Manufactured by Philips Respironics.
Have a question? Call us!1-800-356-5221(Mon-Fri 8AM-10PM CST, Sat 8AM-6PM CST)
This is the company that produces the product being compared.
This identifies the machine as continuous, auto adjusting, or bilevel operation. This does not identify whether the machine automatically adjusts pressure. Auto adjusting refers to APAP, whereas BiPAP Auto is differentiated using the Auto Pressure Adjustment property. BiPAP machines are defined further using Spontaneous or Timed properties.
A CPAP machine blows one constant pressure of air into your passageway throughout the night. Your ideal pressure was determined during your sleep study.
A BiPAP machine delivers two separate pressures of air; One when the patient inhales and a separate pressure when they exhale. The machine alternates between the two set pressures to help optimize your sleep apnea treatment.
An APAP machine automatically adjusts on a breath by breath basis to blow the minimum pressure needed to keep your airway open during sleep. This allows your machine to provide you with your ideal pressure nightly.
Warranty is the length of time that the manufacturer will guarantee a product to be free of defects. Warranties vary in length depending on manufacturer, but generally all machines come with a 2 Year Warranty.
|2 Years||2 Years||2 Years|
This is the level of sound the machine produces at a pressure of 10cm, standing 1 meter away or roughly 3 feet from machine. Measured in Decibels, the values also indicate whether the machine is considered a "quiet CPAP"; see Quiet property.
|31 dB||26.6 dBA||<30 dBA|
This identifies which machines have a decibel rating of 29 and lower. This does not account for use with the humidifier attached, which could supply additional volume that can muffle or amplify sound. This property does not account for noise that travels through the CPAP tubing, seemingly sounding louder than the measured db rating.
This indicates which manuals are included with the purchase of a CPAP machine. Most all machines come with a patient manual; also called 'user manual', which may or may not have pressure setting instructions. Some machines come with both the patient and quick setup guide or both patient and clinician manuals.
|Patient/Quick Setup||Patient/Quick Setup||Patient|
Looking to travel? We have found some machines are easier to travel with than others. These smaller and more lightweight machines are still robust enough for constant daily use as well as travel.
|Under 3 lbs|
This measures only the weight of the machine and does not include total weight of power cables, bag, additional batteries or non-built-in humidifiers.
This is the actual weight of the CPAP Machine without any accessories, power cord, or humidifier. Machines with a weight 3lbs or less are also identified in the Under 3 lbs property.
|2.2 lbs||2.75||2.8 lbs|
This is the combined weight of the machine, heated humidifier, power cables, bag and hose. The weight of the shipping box is not included in the number.
|5.5 lbs||5.1 lbs||6.8 lbs|
This is the combined dimensions of the CPAP with the Heated humidifier.
|8.25" x 8.2" x 4"||10.04"x4.75"x5.91"||6.5" x 10.75" x 4"|
|Entire Package Size|
This is the size of the CPAP with Heated Humidifier in its travel bag.
|13" x 10" x 5"||13.24"x10"x5"||8 " x 14.75" x 8"|
|Machine Size Only|
Measures the overall dimension of the machine only. Machines with a built-in humidifier are marked NA and must refer to Entire Size dimensions.
|7.5" x 5.0" x 3.1"||NA||7" x 5.5" x 4"|
This indicates which heated humidifier works best with the listed CPAP machine. In some instances, Built-in is used to describe a machine/humidifier combination system. The Fisher and Paykel HC150 was used for machines that do not have an integrated or built in humidifier system.
|M Series Heated||HumidAir||System One 60 Series|
Identifies which CPAP has a humidifier that is built into the CPAP. Built-In humidifiers cannot be separated from the CPAP machine.
|Heated Humidifier Type|
This property identifies how the machine incorporates a Heated Humidifier. Build In humidifiers are built into the CPAP machine and cannot be separated from the machine. Integrated humidifiers connect directly to the CPAP machine and they can only be used with compatible CPAP machines. With Integrated humidifiers, the CPAP machine, can be separated and used without the humidifier. CPAP machines that do not have a built in humidifier and do not have an integrated humidifier option have to use a Stand Alone humidifier as the machine's heated humidifier option. Stand Alone humidifiers can be used with any machine and connect to the CPAP machine with an additional hose.
|Ambient Rainout Reduction|
A yes in this field indicates the machine and humidifier have technology to reduce rainout, the water that collects in a hose when using a heated humidifier. Sensors measure the air temperature in the room and adjust the amount of heat and moisture delivered to the mask to reduce or omit rainout.
|No||AutoClimateControl||60 Series Heated Tube|
|Integrated Heated Hose|
This indicates that the machine has an integrated heated hose option to enhance humidification and reduce rainout. An integrated headed hose receives power directly from the machine and does not require a power supply. The tube's heat settings are set through the machine menu screen.
|Humidifier Water Capacity|
This is the maximum water capacity held by the chamber of the compatible humidifier.
|Auto Pressure Adjustment|
This property defines whether the machine automatically adjusts pressure to meet the needs of the CPAP user on a breath-by-breath basis. All APAP machines are defined as 'Auto Adjusting', but some BiPAP's also use an Auto feature on both the IPAP and EPAP. If not marked, Yes, assume the machine does not have AUTO capabilities.
A CPAP (Constant Positive Air Pressure) delivers continuous airflow at a prescribed pressure at 4cm to 30cm. APAP operates between a range and BiPAP machines are a mix of ranges and constant pressures. This pressure is measured in centimeters of water pressure (H2O) and 4-20cm is average pressure range on most CPAP machines.
|4-20cm H20||4-20cm H2O||4-20cm H2O|
|EPAP Pressure Range|
This Property lists the operating range for the Exhalation Positive Airway Pressure (EPAP). This is the pressure setting used when you exhale. EPAP is always lower than the IPAP (inhalation) pressure, making breathing out easier and more comfortable.
Pressure Relief is a feature that lowers your therapy pressure to help with difficulties breathing against the machine's airflow, providing a more comfortable and natural breathing pattern. Assistance can occur on the Exhalation, on the Inhalation, and on both exhalation and inhalation at the same time.
|C-Flex||AutoSet with Easy-Breathe||A-Flex|
The Ramp feature allows the user to start treatment at a lower pressure to fall asleep with, gradually raising the pressure over a set time. This is a comfort setting and can set from 0 to 45 minutes on most CPAP machines.
This property defines whether the machine is capable of continuously blowing a constant pressure. All CPAP machines are defined as 'continuous', but some BiPAP's and APAP's also come with a CPAP mode; some BiPAP and BiLevel machines Do NOT. By setting the IPAP and EPAP to the same pressure, a CPAP Mode is achieved, preventing the EPAP pressure from dropping.
Leak Compensation is a machine feature that identifies mask leaks and adjusts to maintain the delivered pressure as set. If marked N/A assume the information is not available due to being out of production or unavailable.
|Max Operating Altitude|
This is the maximum altitude at which the machine will properly operate.
|8,500 ft||7,500 ft|
|Direct Battery Operation|
Indicates which machines have a DC port in which you can use to connect a battery pack or a deep cycle marine battery with an optional DC cable. This is different from an integrated battery that works only with the machine it was designed for. (i.e. Everest CPAP Machine) see property Integrated Battery
Domestic Voltage is the voltage that is used with a standard wall outlet in the United States and ranges from 100-120 volts. International Voltage can range from 220v-240v AC.
|100-240V AC||100-240V||100-240V AC|
|Optional DC Cable|
A 'Yes' answer indicates that the CPAP Machine has an optional DC cable that plugs directly into a DC port. This allows you to use a DC power source, such as a battery or car cigarette lighter outlet. Some optional DC cables include alligator clips to connect directly to battery terminals. See the "Power" tab of the machine's product page for more detailed information on how the machine works with alternate power sources, and what optional cables and batteries are compatible.
An integrated battery pack attaches to and functions seamlessly with the machine it is integrated with. It allows your CPAP to run on AC and fail over to the DC battery only if necessary.
Identifies which machines are data capable and have the ability to track your therapy progress over time. The machine captures key metrics like AHI (Apnea/Hypopnea Index), Leakage, and most pressure used. Depending on the machine, the data can be retrieved through an on Machine Screen Display (MSD), through Optional Software (OS), and/or through SmartCode (SC).
This property marks the machines that have the ability to record performance data on a removable card. Some machines that are flagged as having software (seeOptional Software), do not have removable memory cards, rather instead, records information on-board and must use a download cable to retrieve the data from the machine.
Software is an option on some CPAP machines. The software can give details on compliance and performance. The patient or physician downloads the data from the CPAP machine to determine how long a patient has used their machine each night and how well the machine is working to stop Apnea/Hypopnea events. This property shows the software package to use for machine that has the ability to transfer data to your computer and report Hours of Usage. See Advanced Software for a list of machines that can report AHI or Leakage.
|Auto Altitude Adjustment|
Altitude Adjustment is defined as the machine's ability to compensate for changes in altitude. Compensation can either occur manually or automatically. Manual adjustments occur within the Setup Menu and must be set by the user. Automatic requires no user intervention.
This feature turns the machines off and on when putting on or taking off the mask. When you put your mask on the machines senses you breathing and turns itself on. Take off the mask and the machine turns off.
|Mask Off Alert|
This feature detects excessive mask leaks due to poor cushion seal or when a user stops therapy by removing a mask when in use. The alert can be in the form of an audible alarm (ALARM) or a text message on the unit's LCD display (LCD).
|LCD; ALARM||No||LCD; ALARM|
Spontaneous (S) mode tells the machine to start blowing at IPAP pressure with no specific interval set. The machine must wait and detect a break in the breathing cycle before reacting, switching from exhalation to inhalation. If a backup rate is needed, then the unit will need a time interval setting and will be marked 'Yes' on the Timed property.
Timed (T) or Spontaneous Timed (ST) modes provide a customizable backup rate that forces the machine to switch from exhalation to inhalation. In ST Mode, the machine monitors the breathing cycle and switches from EPAP to IPAP once the backup time is met or whenever the break is detected through the sensors; whichever occurs first. The time aspect is only meant to act as a backup respiratory rate to the (S) function (see Spontaneous). This is used for patients with central sleep apnea, or those who need non-invasive mechanical ventilation.
|Designed For Her|
These machines were designed with a woman's lifestyle in mind.
|Back Lit Display|
The machine display is lit for ease of reading.
|Backlight Shuts Off|
The backlight for this machine either shuts off automatically after a short intreval or can be set to off.
This machine comes with a 2 Year Manufacturer Warranty. CPAP.com will work with the manufacturer on your behalf if the machine needs repairs. Please follow these steps:
Please note: The manufacturer warranty is voided by water damage or misuse of the machine.
*Note: This is a battery life estimation based on the battery and the machine. Each machine has unique power needs. Look for the Battery kit that has all the cables needed to safely run your machine. Each battery kit page contains a note about which machines are compatible with that specific battery kit. Please always read the "Important Tips" tab for further information on battery use.
"I have used this machine and it's prior model for several years with no problems. I purchased the smaller updated unit both because it was lighter (for traveling) and because I felt I needed a backup in case the other needed to be repaired (assuming it can be, and that Respironica will still be making the parts). I use my older unit at home and take the newer unit when traveling. I choose the Auto C-FLEX model with Humidifier because experience has taught me that I need these features to be comfortable. Auto C-FLEX (with ramping) is incredibly comfortable to use, providing effortless breathing, and changed my life from the very first night I began to use it. I had apnia so bad that I simply counld not stay awake during the day, and started to nod after only an hour behind toe wheel of a car. I snored so loudly that my wife started making me sleep in another room. Life was not good. By the way, I choose the nose gear (Puritan Bennet Breeze SleepGear with Large (Green) Nasal pillows. I have found this system the most comfortable for me, allowing almost unlimited movement at night on both sides, on my back (for the firse time in years), and on my stomach (head to the side of course). The standard hose has proven to be adaquate. The filters are great, especially the micro dust and pollen filter (clean air all the time. Breathing moist air, by the way has a surprising cooling effect on vary hot nights. I have found it valuable to carry an extension cord and one extra milti outlet plug when traveling to allow machine electrical connection to plugs far away from the bed. One final comment. I have found the DC connection capability of the machine to be invaluable when camping. I purchased the DC adaptor, and attached the machine to a Marine Battery rated at 150 amp hours. The machine consumes an average of 3 amp hours (18 amp hours consumed if you sleep a 6 hour night). I re-charge the battery with an inexpensive solar unit the size of a sun visoor and have kept the system going for 2 weeks when fishing. I carry distilled water (20 oz in a Sams Club bottle) and have not run out yet durig a trip - water evaporated slowly in the humidifier. Good product, easy breathing in and out, minimum discomfort. Thanks for the high quality engineering - that such a simple thing could make such a difference in my life at the price it is offered."
"It whines alot, a high pitched sound that is not pleasant.
The lights on the control panel are way to bright.
NOT a good purchase on my part.
1 - This is possibly the best looking CPAP of all time. It looks much better on the nightstand than the others I've had (and I've had a few).
2 - It's a decent size for travel.
3 - The software isn't very sophisticated, but it gets the job done.
4 - It's fairly quiet.
5 - The humidifier is easy to fill.
6 - It seems to be well built.
1 - The blue lights on the buttons are crazy bright. I had to use electrical tape to cover them up.
2 - I don't really like the feel of C-FLEX, so I turned it off.
3 - The humidifier doesn't have enough capacity and it doesn't run hot enough even on the top setting to use all of the capacity in an evening, which leaves me feeling dried out, particularly in the winter. I still haven't found an integrated humidifier in any CPAP as good as the HC150.
4 - I wish the display would provide data from the night before instead of an average over the last week.
5- The 2 cables coming out of the big power brick are a pain.
I am now using a new Respironics PR One Auto as my main CPAP and I actually think it's a step back from this model in most ways (other than the fact that it can supposedly detect and treat RERAs)."
"good product , good service"
"Just got my new M series Auto C-Pap with CFlex. Have had a Respronics machine for 9 years, decided I needed an upgrade with a better humidifier that was heated, after my recent testing, with adding more air flow. So far I'm satisfied with my new machine and it's definatly quieter than my old one."
CPAP therapy provides a constant airflow which holds the airway open so that uninterrupted breathing is maintained during sleep. It is traditionally provided through a nasal mask that seals around the nose to maintain the pressure level.
All CPAP masks work with all machines.
We provide our customers with many tools to make informed decisions about their machine purchases. Options include:
We work very hard to provide many different ways for our customers to compare products. Here are the machine product guides we have created and maintain:
Machines come with a six foot hose, power cord, at least one filter, and manuals. Most manufacturers include a carrying case which is designed specifically for their equipment. CPAP / BiPAP / APAP machines do not come with a delivery system or mask. CPAP Masks must be purchased separately.
To see the list of what specifically comes with each machine, you can browse for a machine. Then on the product page, click the "Specs" tab to see a full list of what comes with the machine.
Yes, all CPAPs use at least one filter that is usually a type of foam material and washable. Some CPAPs offer finer filtration with the addition of a disposable paper filter.
Cleaning and changing filters is the only maintenance required for a CPAP machine.
The filters are located at the back of the machine at the air intake. The image below shows the black foam filter at the back of the Everest 3 CPAP Machine.
Yes. Federal law requires we have a valid prescription on file before we ship your mask, machine and/or humidifier.
We provide many easy ways to get your prescription:
Exhalation relief is a comfort feature offered by two manufactures which reduces the air flow at the time of exhalation making the breathing process more natural.
C-Flex is a pressure relief feature that makes breathing back against CPAP pressure easier to do by reducing the pressure at the beginning of exhalation and returning to therapeutic pressure just before inhalation. Independent studies conducted by leading universities indicate that patient comfort, and therefore, patient CPAP compliance, is higher with machines that use C-Flex. C-Flex is a technology invented by Respironics, is proprietary, and is not available on other brands of CPAP Machines.
C-Flex Easy Breathing Technology Visual Graph
C-Flex vs. Traditional CPAP: Brown University Study
cpaptalk.com Interview, C-Flex in the Remstar Pro and Remstar Auto
C-Flex only works at the start of an exhale. Bi-Flex works during the transition from exhalation to inhalation, the transition from inhalation to exhalation and during exhalation.
The only care a CPAP or BiPAP machine requires is to clean or change the filters at the air intake. This keeps the internal parts from accumulating dust. Fine paper filters should be changed out every 30 days, or when they appear soiled. Foam washable filters should be rinsed with clear running water once a week, allowed to air dry, and reinserted.
There are some other suggested actions to care for your machine:
An APAP prescription must contain all of the following information:
Some CPAP users find it more pleasant to breathe with an APAP than with CPAP. The pressure delivered by an APAP machine automatically changes as needed to deliver the minimal pressure required to maintain the airway. The pressure delivered by a CPAP machine is set to a single pressure, the highest necessary to keep the airway open as determined during the sleep study. This is the case even when the higher pressure is needed only a fraction of the time.
The ramp button on a machine is a feature that allows for a gradual pressure build-up to your prescribed pressure. The feature is enjoyed by those with high pressures because they ease up to their pressure.
CPAP machines which record full data (such as AHI and leak info):
First you need to determine if your machine is configured to operate on DC power and has a DC power outlet. If your machine does have a DC power outlet and you want to run your marine battery, then you will need the correct DC cable for your machine and an adapter cable that fits over the cigarette lighter plug and ends in alligator clips.
CPAP.com sells complete battery kits with everything you need for your machine including the right cables for your machine and the battery. You can find the right battery kit for your machine here.
If your machine does not have a DC power outlet, then you will also need an inverter to be able to run your machine on battery power.
If you have questions about the specific power needs of your machine, review the "Power" tab on your machine's product page, or give us a call at 1-800-356-5221.
A CPAP prescription must contain all of the following information:
CPAP stands for Continuous Positive Airway Pressure. CPAP therapy is the most commonly recommended, and the most effective, treatment for obstructive sleep apnea.
A CPAP machine provides air at a constant prescribed pressure. The air is delivered to the person through a tube and a CPAP mask. CPAP therapy provides a constant airflow which keeps the airway open so uninterrupted breathing is maintained during sleep. The air stream eliminates Sleep Apnea events and allows the person to get a restful sleep.
The level of air pressure required to maintain your airway is determined during your sleep study. Your doctor will write a prescription for a CPAP machine set at that pressure.
CPAP therapy is delivered through a nasal mask that seals around the nose or nasal pillows which seal at the nasal opening. Full face masks are available for a person who breathes through both the nose and mouth. Many innovative and comfortable options are available and advances in the delivery of CPAP therapy are continually occurring.
For instance: Some machines offer a comfort feature such as FLEX or EPR technology. It provides exhalation relief, a slight drop in pressure at the time of exhalation to help make therapy more natural. APAP, BiPAP and BiLevel machines offer various levels of pressure throughout the night.
When a physician orders a pressure change, or a patient moves to an area with a very different altitude and does not have an altitude compensating machine, there are a number of ways to ensure you are receiving CPAP therapy at the correct pressure.
Sleep laboratories and sleep disorder centers may be willing to make this pressure change. Just call a big local hospital or ask you physician for sleep lab phone numbers. Be sure to take your prescription.
A second way is to do it yourself. We sell manometers that are very portable, accurate, and simple to use. All the machines we sell come with instructions on how to set pressure to physician orders. Most patients have little trouble doing this themselves. If you need help we can talk you through the procedure.
Gauge Manometer (for pressure measurements)
Fisher and Paykel Water Column CPAP Manometer with HC325 Chamber
A third option is to ship the machine to us with the new prescription. We will set it and ship it back.
It is the law and good common sense to run all sleep disorder devices at the prescribed pressure. If you think your prescribed pressure is wrong, talk to your physician.
There are a lot of back up battery choices out there that can give you peace of mind in case of a power outage. The Transcend Travel CPAP Machine has Battery Options available for that can set up as a fail-over, back up battery. Review the "Power" Tab on the machine page.
CPAP.com sells battery packs to accompany your machine if an integrated battery is not available. Visit CPAPtalk for more advice specific to your needs, or view this past thread on the topic here.