Frequently Asked Questions

Insurance companies require a prescription and manufacturers try to make sure the insurance companies will cover your CPAP equipment. The prescription also helps companies stay protected by lay and minizmizes their liability insurance premiums.

Having a hard time determining which machine is right for you? Ask yourself these questions:

  1.        Does your prescription require a relatively high pressure setting?
  2.        We recommend an automatic CPAP machine and/or CPAP machine with C-Flex or A- Flex (exhalation pressure relief) features.
  3.        Does your prescription require a lower pressure setting?
  4.        We recommend a standard CPAP machine
  5.        Do I need a Bi-PAP?
  6.        Generally, if you need a bi-level machine your prescription will indicated this specifically and we recommend that is what you get.  If so, you should see a low exhalation pressure number and a higher inhalation pressure number.

If your exhalation and inhalation pressures are within 3 units of each other you could conceivably purchase a CPAP machine with an exhalation pressure relief feature known as C-Flex or A-Flex

These are common terms used to describe pressure relief technology which soften the airflow during exhalation creating a more natural-like breathing experience.  The most common pressure relief technology is found in the REMstar Respironics product line and is referred to as C-Flex. C-Flex kicks in as the patient exhales to slightly reduce the amount of pressure experienced and then immediately returns to the pressure you need as you begin to inhale.

EPR technology stands for Expiratory Pressure Relief

SoftX technology provides exhalation relief as well but this technology is different than the C-Flex and EPR technology. It uses an active, variable resistance valve with a constant motor speed to regulate quick and natural pressure changes. With SoftX the pressure during exhalation is NOT reduced, the position of the valve changes to divert air away from the patient as they exhale.

The result of all these technologies to increase the patient’s comfort levels. They all have three comfort levels to determine the degree of pressure drops from inhalation to exhalation.

The only feedback we have heard from our customers is the fluctuation of noise levels as the pressure relief technology kicks in. To remedy this problem, keep in mind you can turn these comfort technologies on or off!

Of course! All CPAP tubing is a standard 22 millimeters in diameter. All CPAP machine air outlet ports and mask swivels are designed to fit into CPAP tubing. When you purchase a new mask hold your tube in a U-Shape, both ends should look identical. It they do not, you may have a piece of your old mask stuck onto the tube. Remove the old mask part and your new mask will fit in the CPAP tube without a problem.

Soak your tube in HOT, soapy water. The soap should help the piece slide out better. If they still doesn’t work CLICK HERE to purchase a new tube.  

 We recommend doing your research when it comes to narrowing down the right mask for you. After all, the style of your mask is the MOST important part of your CPAP therapy. To determine where to start ask yourself these questions:

  • Do you sleep with your mouth open or closed?
    • Important tips for those who sleep with their mouth open:
      • It is impossible for your obstruction to be opened if the air isn’t being pushed down your airway.
  • Nasal Masks for mouth breathers:
    • You will not be able to get effective CPAP therapy with a nasal mask if you mouth is open while you are sleeping because the air will enter though your nose and right out your mouth. SO, if you prefer a nasal mask then you may need to purchase a Chin Strap to go with it. We recommend a nasal mask for anyone new to CPAP therapy. They are generally less expensive and easier to maintain while keeping a good seal
  • Full Face Masks 

Automatic CPAP machines are wonderful. They automatically adjust and then respond to pressure limitations caused during events that limit your flow of oxygen such as apneas, hypopneas or any other events that could happen during the night. This type of machine will determine the correct pressure setting on a breath-by-breath basis. Overall, they tend to deliver a lot less pressure throughout the night. What that means to you is… a more comfortable night of sleep. Another advantage of an automatic CPAP machine is not having to worry if you were prescribed the right pressure setting by your doctor because this type of machine will adjust accordingly. Having an “automatic” CPAP machine will also cut back on your visits to sleep centers in the future. This machine has a pressure feedback device that senses the amount of pressure you need throughout a night and typically delivers about 40% less which makes CPAP therapy more tolerable for new CPAP users. With this type of machine you will have the ability to set it to automatic mode or “CPAP” constant mode. Some automatic machines have the ability to detect the difference between obstructive apneas/hypopneas and central apneas/hypopneas. Ask your doctor for recommendations if you have been diagnosed with “Central Sleep Apnea”.

C-Flex is a term coined by Philips Respironics for a feature commonly referred to as exhalation pressure relief and is considered a comfort feature. C-Flex detects when the CPAP user begins to exhale and then lowers the pressure just a little bit to accommodate.  The C-Flex feature found on several Respironics CPAP modles makes the regular CPAP machine behave much like a Bi-PAP machine.

The difference between the two is the amount of pressure you will experience when you breathe out. With a C-Flex the pressure will only drop about three units and may be a slightly different pressure with each breath. With a BI-PAP machine there are two different pressure settings that have been programmed into the machine, with each breath the BI-PAP will adjust to your precise pressure setting determined by your doctor.

Steps to set up your machine:

  1. Connect the tubing that comes with the machine to the air outlet port
  2. Connect your mask to the other end of your tube (both ends of your tube should be identical, if they are not you may have a piece from your old mask stuck inside you tube. This needs to be removed. Before your new mask will fit.)
  3. Humidifier- If you have a humidifier, fill it with cold water and attach it to your machine.
  4. Plug in the CPAP machine
  5. Put on your CPAP mask
  6. Turn on your CPAP machine

The COPD Store does not accept insurance as payment. You will need to pay with a credit card, check, pay-pal or money order. You can then file a claim to be reimbursed with your insurance company.  Click Here to see Insurance reimbursement codes. The best way to find out if the insurance will cover all or part of the expense is to call the phone number located on the bottom of your insurance card and ask.  Make sure you ask for your “out-of-network” benefits for CPAP equipment.


CPAP Equipment Description


Tubing w/ integrated heating


Combination oral/nasal mask


Oral cushion for combination oral/nasal mask – replacement


Nasal pillows for combination oral/nasal mask – replacement


Full face mask


Face mask interface – replacement


Cushion for use on nasal mask interface – replacement


Pillow for use on nasal cannula type interface – replacement


Mask interface – mask or cannula




Chin strap




Filter, disposable


Filter, non-disposable


Oral interface


Exhalation port – replacement


Humidifier chamber – replacement


Monitoring feature/device


Bilevel CPAP Machine


Bilevel CPAP Machine w/ backup rate


CPAP Humidifier – cool


CPAP Humidifier – heated


CPAP Machine