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GoodKnight 420SP Travel CPAP Machine. Not Available.

The 420SP is the size of two VHS video cassettes stacked on top of each other. It is the lightest CPAP on the market. Best of all, it is built to last and backed by a two year manufacturer warranty which means that although it is a travel CPAP, you can plan on this little guy lasting as long as any other CPAP on the market. It is a great machine.

Manufactured by Puritan Bennett. This is a newly released product.

4.8 of 5 12 Reviews

This product no longer available and this information is for reference only. Newer Model Available: Sandman Info HC CPAP Machine with Built In Heated Humidifier.

Replacement Parts

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1-800-356-5221(Mon-Fri 8AM-10PM CST, Sat 8AM-6PM CST)

Product Features

This is a standard CPAP machine which delivers one level of pressure during inhalation and exhalation. It suits most patients with obstructive sleep apnea.

The Puritan Bennett GoodKnight 420SP CPAP includes the following features:

Smallest, lightest CPAP on the market.
SilverLining Data Management software option to download compliance and session data. (Software is sold separately.)
International power supply to operate on any AC current from 110 to 240 without adjustment to the machine. (An adapter may be needed to plug the CPAP into a wall outlet outside the US.)
Automatic altitude compensation adjustment.
Direct DC operation without the need for a DC/AC inverter, just a cable and adapter which are sold separately.
Automatic leak compensation.
Two washable, reusable pollen filters are included; optional ultra-fine filters are available.
Two year manufacturer warranty against defects.
Does not have the pressure line, which is an upgrade from the 420s.

Specifications

This Product Includes...

420SP CPAP Machine
6 Foot Hose
Carrying Case
2 Reusable Foam Filters
All Manuals
Power Supply

Product Specifications

Pressure Range	4cm to 20cm H2O
Ramp Time	0 to 30 min
Starting Ramp Pressure	From 4cm up to CPAP pressure, patient-adjustable
Dimensions	5.6" x 2.9" x 7.7"
Weight	CPAP: 1.54 lbs.; Power Supply Module (included): .21 lbs.; Total weight 1.75 lbs.
Altitude Compensation	Automatic - maximum height 7800 feet.
Electrical Requirements	100 - 240 AC, 12volt DC

Associated Specifications
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	Yes
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.	Auto
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.	No
Heated Humidifier: 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.	GoodKnight H2O
Manufacturer: This is the company that produces the product being compared.	Puritan Bennett
Advanced Software/Data: 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).	OS
Travel Sized: 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.	Yes
Pressure Range: 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
Voltage Range: 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
Data Card: 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.	No
Auto ON/OFF: 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.	No
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.	Yes
Built-In Humidifier: Identifies which CPAP has a humidifier that is built into the CPAP. Built-In humidifiers cannot be separated from the CPAP machine.	No
Type: 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.	CPAP
Optional Software: 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.	SilverLining
Machine Weight: 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.	1.75 lbs
Optional DC Cable: A 'Yes' answer indicates that the CPAP Machine has an optional DC cable that plugs directly into a DC port (see _Direct Battery Operation_). This allows you to use a DC power source, such as a battery or car cigarette lighter. Although some cables already come with battery terminal leads, some DC cables will need a separate part that connects the cigarette lighter adapter to another adapter with terminal leads.	Yes
Warranty: 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
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, a text message on the unit display or a digital record for use with software afterward.	Yes
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.	NA
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.	Integrated
Integrated Battery: 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.	No
Easy Breathing: 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.	No
RainOut Reduction: Manufacturers are finding ways to reduce the amount of water that collects in the CPAP hose when using a Heated Humidifier. The Rainout Reduction feature varies by manufacturer and machine and can be anything from an integrated heated hose, to technology that measures the humidity at the mask and adjusts the humidity to reduce rainout.	No
Entire Weight: This is the combined weight of the machine, heated humidifier, power cables, bag and hose.	5.86 lbs
Sound Level: 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
Spontaneous: 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.	No
Ramp: 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.	Yes
Entire Size: This is the combined dimensions of the CPAP with the Heated humidifier.	11" x 6.7" x 3.7"
Timed: 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.	No
Quiet: This identifies which machines have a decibel rating of 28 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.	No
Entire Package Size: This is the size of the CPAP with Heated Humidifier in its travel bag.	11" x 12.5" x 5"
Manuals Included: 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/Clinician
CPAP Mode: 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.	Yes
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.	5.6" x 2.9" x 7.7"

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CPAP Power Options

Universal Power

The Goodknight Series operate automatically between 110v and 240v AC. When traveling either inside or outside the USA, there are no switches to switch or fuses to change. The machine will automatically sense what voltage is needed and set itself to run on the power needed.

The user will need to adapt the plug that goes into the wall to fit the style of outlet socket that is being used. This is simply done with a Power Adapter Plug kit. This is the same type of plug adapter that would be used with a hair dryer or an electric shaver. World Traveler Power Adapter Plugs.

GoodKnight Series DC Power Cord with Cigarette Lighter Adapter

The Goodknight series come equipped with a DC plug on the back of the unit. This allows the user to connect the CPAP to an external DC battery source. Using a Puritan Bennett, 12volt DC Power Cord, the GoodKnight 420 Series can be powered by plugging into a cigarette lighter plug. This is ideal for traveling by car, boat, or recreational vehicle that is equipped with a cigarette lighter plug.

CPAP.com Battery Kit for GoodKnight 420 Series Machines

The 2.5 lb CPAP.com Battery Pack is surprisingly small and lightweight. The lithium ion battery can be recharged at any discharge level without losing charge time due to battery memory loss. This battery has been approved by the United Nations and Department of Transportation as tested safe for travel. This battery kit comes with the CPAP.com battery and the GoodKnight 420 Series 12 Volt DC Power Cord.

Respironics Battery Kit for GoodKnight 420 Series

This portable battery pack is an external lead acid battery that is the ultimate in power, portability and convenience. This battery kit comes with the Respironics battery and the GoodKnight 420 Series 12 Volt DC Power Cord.

Machine Pressure and Battery Options and Performance *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. Please always read the "Important Tips" tab for further information on battery use. Input Pressure Setting:

CPAP Product Customer Reviews

Sort: Show Star Rating:

ross – January 17, 2009

"great machine- very quiet"

Works Great :-)

Daphne, MN – August 19, 2008

"This little machine is great! It's very quiet, the ramp feature is really nice and it really is compact. I was also very happy with the bag that comes with it. It's sturdy and pretty well padded. I recommend this machine."

GoodKnight 420sp cpap

John H, San Pablo, CA – April 25, 2008

"I'm very happy with the new cpap machine,much smaller than my last cpap and works better also."

GoodKnight 420SP CPAP with bag, hose and manuals

THEODOR A. – October 16, 2007

"GoodKnight 420SP CPAP is a reliable device"

Ben B. – August 28, 2007

"The first two nights were difficult getting accustomed to this mask, oxygen in my face and trying to breathe normally. I sleep on my stomach and am learning to sleep on my back. I think it will get better sleeping through the night.

My wife, says she is doing well and is now sleeping through the night. The CPAP & humidifier are great. I recommend the humidifier when purchasing the CPAP."

Purchase this on CPAP.com? Add Your Review

CPAP Learning Center

Frequently Asked Questions (FAQs)

How can I compare different machines?

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:

CPAP Machine Comparison Guide. This guide stacks up every CPAP machine we sell, feature by feature. If you don't know the meaning of a feature, click the question mark for a definition. The links below will take you to the most popular CPAPs, or all CPAP machines we sell.

Compare Most Popular CPAP Machines

Compare All CPAP Machines
Auto Adjusting Machine (APAP) Comparison Guide. This guide stacks up every APAP machine we sell, feature by feature. If you don't know the meaning of a feature, click the question mark for a definition. The links below will take you to the most popular APAPs, or all APAP machines we sell.

Compare Most Popular APAP Machines

Compare All APAP Machines
BiPAP, VPAP and BiLevel Comparison Guide. This guide stacks up every BiPAP machine we sell, feature by feature. If you don't know the meaning of a feature, click the question mark for a definition. The links below will take you to the most popular BiPAPs, or all BiPAP machines we sell.

Compare Most Popular BiPAP Machines

Compare All BiPAP Machines

Which CPAP masks work on which machines?

All CPAP masks work with all machines.

How do I choose the machine that is right for me?

We provide our customers with many tools to make informed decisions about their machine purchases. Options include:

Calling a CPAP Expert Toll Free. 1-800-356-5221.
Comparison Charts. These charts compare available machines, feature by feature. If you don't know the meaning of a feature, click on the question mark for a definition. Click on the image or name of the product for more detailed product information, pictures and resources.

CPAP Comparison Chart

APAP Comparison Chart

BiPAP Comparison Chart
Help Me Choose Guide. We created a guide to help you select the right machine according to your preferences. The guide asks you a series of questions regarding your preferences and your prescription. Based on your answers we provide you with a comparison chart of the machine that meet your criteria. Get started here:

Help Me Choose - Machine
Browse Our Machine Product Categories. These categories show each machine our company offers, ranked by popularity. Popularity is determined by a mix of sales data and our in house opinion of the quality of the machine based on our experience and customer feedback. The best products float to the top of our categories.

CPAP Machine Category

APAP (Auto Adjusting) Machine Category

BiPAP (Two Pressure) Machine Category

What comes with my machine?

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.

Are prescriptions required for mask, machine and/or humidifier purchases?

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:

We can request your prescription for you! When you checkout, just let us know you would like us to request your prescription, or you can log into your account to have us request your prescription.
Fax your prescription to our Toll Free fax number: 1-866-353-2727, or our international fax number: 713-541-7370
Email your prescription to cpap@cpap.com
Upload your prescription in your account, under the prescriptions section

For more information on prescriptions, please see our Prescription Section of the Learning Center.

What are the CPAP, BiPAP and Sleep Apnea related billing codes?

EO601 RR is CPAP rental
E0601 NU is CPAP purchase
A7034 is CPAP mask
A7032 is CPAP Nasal mask cushion
A7033 is CPAP Nasal pillows
A7030 is CPAP Full Face mask
A7031 is CPAP Full Face mask cushion
A7044 is CPAP Oral Interface
A7027 is CPAP Hybrid mask
A7028 is CPAP Hybrid mask cushion
A7029 is CPAP Hybrid mask nasal pillow
A7046 is CPAP Humidifier Chamber
A7037 is CPAP tubing, long and short hoses
A4604 is CPAP Heated tubing
A7038 is CPAP disposable filter
A7039 is CPAP gross particle (foam) filter
A7035 is CPAP headgear
A7036 is CPAP chinstrap
E0561 NU is CPAP Passover Humidifier
E0562 NU is CPAP Heated Humidifier
E0470 RR is BiPAP rental
E0470 NU is BiPAP purchase
E0471 RR is BiPAP-ST rental
E0471 NU is BiPAP-ST purchase

Other CPAP items are listed under E1399, which is miscellaneous.

What maintenance is required on machines?

The only care required for machines is to clean or change the filters at the air intake of the machine to keep the internal parts from accumulating dust.

There are other suggested actions to care for your machine:

Keep the area around your machine clean. Remove any dust from around your machine to improve the air quality delivered to your machine.
Keep the air intake of the machine unblocked. Curtains, bedding, and papers can easily block the air intake of your machine, reducing the airflow to your machine.
If you have a humidifier, it is suggested that you do not pick up the machine with the humidifier attached. With most machines, it is easy to spill water from the humidifier into the machine and cause damage. To avoid this, it is suggested to remove the machine from the humidifier instead of transporting them together.
If you have a humidifier, it is also suggested that you empty the water from the chamber every morning. Accidents happen. If a family pet, or family member moves the machine and humidifier, when there is water in the chamber, it is more likely an accident could happen where water is spilled into your machine.

What does CPAP therapy do?

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.

Do all CPAPs use filters?

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.

What is exhalation relief?

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.

Respironics = C-Flex, C-Flex+, A-Flex and Bi-Flex
Resmed = EPR (Expiratory Pressure Relief)

Will my CPAP operate on DC / battery power?

All CPAPs will operate on DC power with the use of an inverter to change the current from DC to AC before it reaches the machine. However, many will operate on DC power without the need for an inverter, just a power cord that plugs into the CPAP and ends in a cigarette lighter plug.

Inverters do require a lot of power. If you need to use an inverter to run your machine on battery power, the inverter will probably take about half the life off the battery.

To determine if your CPAP will operate without an inverter, look for a DC outlet on the machine, either at the back or on the side, with a single opening directly in the center. It should be labeled "DC Power" or similar term. You can also review our Compare Charts to see if your machine has a optional DC cable option.

Will my CPAP operate overseas?

An adapter may be required to plug a US power cord into a wall outlet in a foreign country. CPAP.com sells an assortment pack of World Traveler Power Adapter Plugs, which allow CPAP machines to plug into different types of wall sockets found in different countries.

All the models CPAP.com sell contain power converters that enable the machine to operate on any AC current from 100 to 240 volts without any adjustment. Check with your dealer or manufacturer to see if your machine needs an external converter that lowers the voltage from 240 to 120 VAC.

How do I use a battery to operate my CPAP?

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.

What type of battery should I use?

For longer battery use, we suggest a deep-cycle marine battery. A CPAP set at 10cm will usually run for about three nights before having to recharge a deep cycle marine battery. A car battery will usually run a machine for 8 hours and still start the car.

There are small, portable battery packs that will operate a CPAP set at 10cm for at least one night, or about eight hours. CPAP.com sells full battery kits that come with everything needed to run your machine off battery power including the right cables needed for your machine and a battery. You can find the battery kit for your machine here. On each battery kit page, you can input your machine and pressure setting to see an estimate battery life for your machine.

How do I prepare for plane travel with CPAP?

Your CPAP does NOT count against your carry on limits. Allow for an additional 10-20 minutes in security, not likely but it happens. If airport personnel ask about the CPAP, let them know politely that it is a medical device (a CPAP unit). Most of them understand what it is and that it is an exception to the normal rules. We provide a luggage tag for CPAP systems: http://www.cpap.com/productpage/medical-identification-luggage-tag-cpap-equipment.html

You can use your CPAP on board, just use batteries or make sure you're seated by a power outlet. You can call or reserve one of these seats online with most airlines. Alternatively visit Seat Guru , a website that works with most major airlines.

Be sure to bring spare parts and a back up mask. If you're in a bind, CPAP.com delivers all over the US and to most international destinations.

How do I prepare for international travel with CPAP?

To prepare for your international travel, be sure to:

Check the voltage of your destination. You may need a plug adapter for your machine.
Go ahead and pack spare parts to your equipment, CPAP.com can ship to most destinations around the world, but you may not want to additional wait and cost when you know you have a spare mask sitting at home.
Review the general travel tips above.