AirSep Focus vs Freestyle vs Inogen: Comparing Portable Oxygen Concentrators

When choosing a portable oxygen concentrator (POC), patients have various options, each with its own set of features and specifications tailored to meet the diverse needs and lifestyles of users. Among these, the AirSep Focus, AirSep FreeStyle, and Inogen One series stand out in the market. These devices differ significantly in size, weight, oxygen output, and battery life, making it crucial for buyers to understand how each aligns with their personal health requirements and daily routines.

Three portable oxygen concentrators side by side: Airsep Focus, Freestyle, and Inogen. Each with distinct designs and features

Understanding the differences between the AirSep and Inogen models can be challenging. The AirSep Focus is recognized for its exceptionally light weight, making it a suitable option for those prioritizing portability above all else. In contrast, the Inogen One G3 and G5 models provide higher oxygen output, which may be vital for users with greater oxygen needs. Technical specifications, such as oxygen flow settings, battery duration, and device dimensions, are important factors to consider.

Key Takeaways

  • Different POCs cater to varying oxygen needs and user preferences.
  • Technical specs and device size are critical in choosing the right POC.
  • The choice of a POC should be influenced by lifestyle and health requirements.

Overview of Portable Oxygen Concentrators

Three portable oxygen concentrators lined up on a table: Airsep Focus, Freestyle, and Inogen. Each device has its own unique design and features

Portable Oxygen Concentrators (POCs) are vital devices for individuals requiring oxygen therapy, especially those diagnosed with COPD and other lung diseases. They have evolved significantly, delivering greater mobility and quality of life to users.

Understanding Oxygen Therapy

Oxygen therapy refers to the provision of supplemental oxygen to individuals with respiratory disorders that prevent them from inhaling sufficient amounts of ambient oxygen. This therapy is essential in managing Chronic Obstructive Pulmonary Disease (COPD) and other lung-related conditions. A portable oxygen concentrator (POC) is a medical device designed to extract oxygen from ambient air, concentrate it, and deliver it to the user in a breathable form.

Evolution of Portable Oxygen Concentrators

Initially, oxygen therapy required stationary tanks, which limited a patient’s mobility. With technological advancements, portable oxygen concentrators were developed. These devices are lighter, more compact, and battery-powered, allowing users to maintain their active lifestyles. They operate on the principle of pressure swing adsorption, filtering nitrogen from the air and providing nearly pure oxygen to the user.

Technology and Design

Modern POCs boast advanced features thanks to cutting-edge technology and thoughtful design. They now include:

  • Adjustable oxygen flow settings to meet individual needs.
  • Battery options for extended mobility.
  • Compact and lightweight construction that meets FAA requirements for air travel.

Moreover, models like the AirSep Focus and Inogen One series have furthered the convenience and functionality of these devices. For instance, the AirSep Focus is known for its extremely light build, while the Inogen One G5 offers a high oxygen output with multiple flow settings to suit varying patient needs. The design of POCs often balances between maximizing oxygen deliverability and maintaining ease of portability.

Comparing AirSep and Inogen Models

Two portable oxygen concentrators, AirSep Focus and Freestyle, and Inogen, side by side for comparison

When choosing between AirSep and Inogen portable oxygen concentrators, patients often consider specifics such as weight, oxygen output, and dimensions to meet their respiratory needs.

AirSep Focus Features

The AirSep Focus is recognized for its ultra-light design. It weighs approximately 2 pounds and can deliver oxygen at a setting of 2, roughly equivalent to 330 ml/min. Its compactness and feather-light characteristics make it highly portable for users with active lifestyles.

Inogen One G3 Insights

On the other hand, the Inogen One G3 offers a balance between portability and higher oxygen delivery. It has a weight of 4.8 pounds with dimensions of 7.25 x 3 x 8.75 inches. The Inogen One G3 is known for its effectiveness in mobility and extended battery life options, providing a practical solution for those requiring frequent oxygen.

AirSep Freestyle Series

The AirSep Freestyle Series includes models such as the AirSep Freestyle 3 and the AirSep Freestyle 5. The Freestyle 3 is comparable in weight to the Inogen One G3 but is smaller in size. Meanwhile, the Freestyle 5, weighing 6.2 pounds and measuring 10.7″H x 6.6″W x 4.4″D, stands out for its ability to deliver a higher oxygen capacity, suitable for users with greater oxygen needs.

Inogen One G5 Advantages

Lastly, the Inogen One G5 boasts the highest oxygen output in the Inogen line for pulse flow portable concentrators. It provides patients with extended freedom due to its long battery life and adaptable flow settings. The Inogen One G5’s capabilities are designed to accommodate a wide range of oxygen demands, making it a versatile choice.

Device Specifications

The three portable oxygen concentrators are laid out side by side, with their specifications and features clearly displayed for comparison

In this section, the physical characteristics, oxygen delivery capabilities, and battery performance of the AirSep Focus, AirSep FreeStyle, and Inogen One devices are examined to guide users in selecting the right portable oxygen concentrator.

Size and Weight Analysis

  • AirSep Focus: It stands tall at just over half a foot and is notable for being extremely lightweight at less than two pounds. Its compactness is a key feature, providing the ultimate in portability.
  • AirSep FreeStyle 5: This device is heftier with a total weight of 6.2 pounds, with dimensions measuring 10.7″ H x 6.6″ W x 4.4″ D.
  • Inogen One G3: The device weighs 4.8 pounds and is sized at 7.25″ H x 3″ W x 8.75″ D, showcasing its small footprint and manageability.
  • Inogen One G5: This unit is recognized for balance between size and performance, but specific dimensions and weight are not detailed in the provided search results.

Oxygen Output Capacities

  • AirSep Focus: Offers a pulse dose oxygen delivery with a setting up to 2, equivalent to roughly 330 ml/min.
  • AirSep FreeStyle 5: The FreeStyle 5 pushes the envelope in versatility, though exact oxygen output statistics are not specified.
  • Inogen One G3 and G5: The Inogen One G3 provides comprehensive oxygen delivery, but specific output ratings are not mentioned. Meanwhile, the Inogen One G5 is reputed to have the highest oxygen output among pulse flow oxygen concentrators; however, detailed figures have not been furnished.

Battery Performance

  • AirSep Focus: The battery life specifics are not mentioned, but its compact size suggests a trade-off with battery duration.
  • AirSep FreeStyle 5: Battery specifics are not delineated, but the portability hints at a balance between battery longevity and mobility.
  • Inogen One G3: Battery details are omitted, yet it is generally known that the Inogen One series emphasizes battery efficiency.
  • Inogen One G5: Boasts a strong battery performance but the precise battery life specifications are not outlined in the provided search results.

Patient Lifestyle Considerations

A table displaying the Airsep Focus, Freestyle, and Inogen portable oxygen concentrators, surrounded by various lifestyle items such as a backpack, travel mug, and exercise equipment

When selecting a portable oxygen concentrator, patients must consider how the device will integrate with their daily activities, mobility needs, and desire for convenience.

Activity Levels and Oxygen Needs

Patients with an active lifestyle require a device that can keep up with their oxygen demands during various activities. The AirSep Focus is designed for low oxygen requirements, offering settings up to 2, equivalent to about 330 ml/min. For those requiring higher settings, the Inogen One G5 provides greater oxygen output, catering to a broader range of activity levels.

Portability and Lifestyle Impact

The physical size and weight of a portable oxygen concentrator are critical for patients on the go. Lightweight options such as the AirSep Focus, at just over 1.75 pounds, supports patients who prioritize minimal weight. In comparison, the Inogen One G3 weighs 4.8 pounds. While heavier, it remains a compact choice for an active individual. Carrying options like a backpack or shoulder strap further enhance portability, and some models, such as the AirSep FreeStyle 5, also offer an airbelt for additional support and convenience.

Concentrator Weights:

  • AirSep Focus: 1.75 lb
  • Inogen One G3: 4.8 lb
  • AirSep FreeStyle 5: 6.2 lb

Size Comparisons:

  • AirSep Focus: Lightest, focused on portability
  • Inogen One G3: Compact, with a higher oxygen output
  • AirSep FreeStyle 5: Larger, for increased oxygen delivery

Accessories for Convenience

To enhance the user’s experience and adaptability, accessories such as carrying bags, external batteries, or airbelts can be significant factors in daily oxygen therapy management. For example, the AirSep FreeStyle 3 comes with a three-year warranty and a selection of accessories, likely to ease integration into daily life and provide peace of mind. The Inogen One G3 and its accessories are designed to be compact for active users requiring a balance between oxygen availability and ease of movement.

Operational Aspects

Three oxygen concentrators: AirSep Focus, FreeStyle, and Inogen, placed side by side with their operational aspects highlighted

The operational features of the AirSep Focus, AirSep Freestyle, and Inogen devices are critical for users to understand, ensuring they can manage their oxygen delivery efficiently and safely. The user interface and alert systems across these models determine the overall user experience in day-to-day use.

Control and Ease of Use

The AirSep Focus and AirSep Freestyle models feature a straightforward control panel with clearly marked push-buttons for operation simplicity. The Inogen models also prioritize ease of use with intuitive controls. Each device’s control panel allows users to adjust oxygen flow settings with minimal effort, ensuring quick and efficient operation.

Safety Features and Alarms

These portable oxygen concentrators come equipped with audio and visual alerts that notify users of various conditions. The safety features include alarms for low battery, no breath detected, and technical issues. For instance, the Inogen series provides distinct audio and visual alerts that inform the user immediately should an issue arise, enhancing the device’s safety profile.

Understanding the LED Display

The LED display on these units is designed to be user-friendly. For example, the AirSep Freestyle includes an illuminated LED display that shows the current operating status, battery life, and any active alarm notifications, which are easy to understand. The Inogen devices similarly utilize a bright, clear LED screen that indicates flow setting, battery status, and maintenance alerts.

Technical Specifications

The three portable oxygen concentrators sit side by side on a clean, white surface, each with their own unique design and features

In choosing between the AirSep Focus, AirSep FreeStyle, and Inogen portable oxygen concentrators, potential users should consider the technical specifications that directly affect functionality and user experience.

Pulse Dose vs. Continuous Flow

  • AirSep Focus: Delivers oxygen on a pulse dose setting with a maximum of 2, which is roughly equivalent to 330 ml/min.
  • AirSep FreeStyle: Provides pulse dose settings, though specific ml/min figures vary by setting.
  • Inogen One G3: Offers pulse dose oxygen, details on ml/min are not provided in the search result snippet.
  • Inogen One G5: The search result snippet does not specify a pulse dose, but it is indicated to have a higher oxygen output compared to pulse flow units.

Noise Level and User Comfort

  • AirSep Focus: The operational noise level specifics are not given in the search results, but as a smaller device, it may generally be quieter.
  • AirSep FreeStyle: Noise specifications are not detailed in the provided search results.
  • Inogen One G3 and G5: Again, there is no specific information about the decibel levels during operation within the search results provided.

Durability and Maintenance

  • AirSep Focus:
    • Weight: 1.75 pounds
    • Durable for its small size, although specific durability features are not enumerated in the search results.
  • AirSep FreeStyle:
    • Weight: 6.2 pounds
    • Size: 10.7″ H x 6.6″ W x 4.4″ D
  • Inogen One G3:
    • Weight: 4.8 pounds
    • Size: 7.25″ H x 3″ W x 8.75″ D

Certifications and Approvals

In the context of portable oxygen concentrators (POCs), certifications and approvals are vital for ensuring patient safety and compliance with travel regulations. Each device may have varying certifications that authenticate its use for medical needs and its acceptability on airlines.

Three portable oxygen concentrators lined up with their respective certifications and approvals displayed prominently

FAA Approval for Travel

Both the AirSep Focus and AirSep FreeStyle 5, as well as the Inogen One devices, have FAA approval. This approval indicates that they are permitted for use during flights on most major airlines. Here are the specifics:

  • AirSep Focus: FAA approved for in-flight use
  • AirSep FreeStyle 5: FAA approved for in-flight use
  • Inogen One G3: FAA approved for in-flight use
  • Inogen One G5: Also FAA approved, suitable for the frequent traveler.

Medical Certifications and Warranties

Medical certifications assure that the POCs adhere to health and safety standards, while warranties provide assurance on the reliability and service support for the devices.

  • AirSep Focus:
    • Medical certifications: Meets rigorous safety standards, though specifics may vary.
    • Warranty: Typically offers a limited warranty; terms are specific to the seller.
  • AirSep FreeStyle 5:
    • Medical certifications: Compliant with necessary health standards. The exact certifications depend on the country of distribution.
    • Warranty: Comes with a standard warranty, specifics should be confirmed with the provider.
  • Inogen One Series (G3 and G5):
    • Medical certifications: Both models are typically held to high safety and health standards such as US FDA approval.
    • Warranty: Generally come with a comprehensive warranty, details of which are specified by the manufacturer or distributor.

It’s crucial for users to verify the warranty and certification details at the time of purchase as they can vary between different vendors and over time.

Manufacturer and Brand Information

Three portable oxygen concentrators arranged on a table with their respective manufacturer and brand information displayed prominently

In the landscape of portable oxygen concentrators (POCs), manufacturers like AirSep and Inogen are renowned for their contributions to individuals with respiratory conditions such as COPD and asthma. These companies are dedicated to providing innovative oxygen therapy products, designed with input from respiratory therapists and built to improve the quality of life for those with various lung diseases.

Company Backgrounds


  • Founded: Known as a pioneer in the industry.
  • Specialization: Focuses primarily on oxygen concentrators and offers a range of products suitable for personal and medical use.
  • Products: Includes the AirSep Focus, FreeStyle, and FreeStyle 5 among its line of portable oxygen solutions.


  • Founded: Established with the aim to improve the quality of life for those requiring supplemental oxygen.
  • Specialization: Inogen’s core concentration is on portable oxygen concentrators.
  • Products: The Inogen One series, including the Inogen One G5, symbolizes the brand’s innovative approach to POCs.

Customer Support and Services


  • Contact: Provides customer service through various channels including phone support.
  • Expertise: Known for attentive customer service and resources for both users and healthcare professionals.


  • Contact: Offers robust support with accessible customer service via phone.
  • Education: Inogen frequently liaises with respiratory therapists to inform users about product use and maintenance.

Both manufacturers invest heavily in customer support to ensure users can effectively manage their respiratory illnesses and continue to lead active lives with less limitation from their lung diseases. Their services include resources for troubleshooting, product inquiries, and general support for users navigating the complexities of oxygen therapy.

Purchasing and Support

A customer comparing AirSep Focus, Freestyle, and Inogen for purchase and support

When considering the purchase of portable oxygen concentrators like the AirSep Focus, AirSep FreeStyle, or the Inogen series, it’s important to consider not only the device specifications but also the avenues for making your purchase and obtaining support post-purchase.

Online Home Healthcare Marketplaces

OxygenTimes serves as an extensive online home healthcare marketplace that operates out of India and provides potential buyers with a variety of options, including the AirSep and Inogen portable oxygen concentrators. They have established themselves with a corporate office at WeWork BlueOne Square, Udyog Vihar Phase-4, Gurugram, and numerous warehouses, ensuring availability across over 50 locations in India. Their GSTIN is readily available for business transactions, adding to their credibility as a reputable source for healthcare products.

  • Main features of OxygenTimes:
    • Hosts a wide array of impartial reviews, articles, guides, and videos.
    • Functions as a comprehensive home healthcare platform.
    • Offers detailed product listings with clear prices and specifications.

After-Sales Support and Contacts

Post-purchase support is crucial, and OxygenTimes accommodates buyers with a dedicated web manager and content writer who ensure that all customer inquiries are handled efficiently. Customers can reach out via WhatsApp for instant communication or utilize the contact details provided on the marketplace’s site for more in-depth support.

  • Support channels available:
    • WhatsApp: For quick queries and real-time assistance.
    • Email and Phone: Detailed contact information listed on the site for more comprehensive support.
    • Physical Address: OxygenTimes’ corporate office address is provided for direct interaction or mailing purposes.

Buyers should feel confident in receiving knowledgeable and neutral support throughout their purchasing journey and beyond with these resources.

Frequently Asked Questions

Three portable oxygen concentrators displayed side by side with their respective names: Airsep Focus, Freestyle, and Inogen

When considering portable oxygen concentrators, potential users often inquire about specific aspects of the devices to ensure they meet their needs. This section addresses some of the most common questions regarding the AirSep Focus, AirSep Freestyle, and Inogen models.

What are the key differences between AirSep Focus and Freestyle models?

The primary differences between the AirSep Focus and the AirSep Freestyle involve oxygen output and device size. The Focus offers up to a setting of 2, equivalent to approximately 330 ml/min, while the Freestyle 5 delivers higher settings. Additionally, the Focus is the smaller and lighter unit designed for ultra-portability.

Does the Inogen series offer portable options comparable to AirSep’s offerings?

Yes, the Inogen series offers portable oxygen concentrators like the Inogen One G3 and G5, which compete with AirSep’s offerings in terms of weight, size, and oxygen delivery. Certain models have higher oxygen output catering to users with various needs.

What are the battery life comparisons between AirSep and Inogen portable concentrators?

Battery life varies across different models and settings. The Inogen One G3 and G5 models have a battery life that can last up to 4.7 and 6.5 hours, respectively, on a single charge at specific flow settings. The AirSep concentrators generally have shorter battery lives but may vary with different models and usage settings.

Can either the AirSep or Inogen models provide both pulse dose and continuous flow?

Inogen models primarily offer pulse dose oxygen delivery. Meanwhile, the AirSep Freestyle 5 provides pulse dose settings. The continuous flow option is not commonplace in the smaller, lightweight portable models and is typically found in larger, stationary concentrators.

How do the weight and size specifications of the AirSep Focus and Freestyle differ from Inogen’s portable units?

The AirSep Focus is one of the lightest models available, weighing approximately 800 grams. It is smaller in size compared to most of Inogen’s offerings, designed for maximum portability. Inogen’s models like the G3 and G5 are also designed to be compact and portable, with the G3 weighing around 4.8 pounds.

What are the maintenance and reliability reviews for the AirSep versus Inogen portable oxygen concentrators?

Users have found that both AirSep and Inogen models require routine maintenance, including filter changes and external cleaning. Reliability reviews often highlight the dependability of Inogen units, but the AirSep models also receive positive feedback for their durability and ease of use.

The team at are experts when it comes to oxygen concentrators. We are dedicated to providing as much help as we can for people who are undergoing oxygen therapy and need help with oxygen concentrators. We research and immerse ourselves in the industry and are assisted by our team of medical experts.

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