By Courtney Sornberger, Chief Sales Officer
14+ Years in Portable Oxygen · Updated February 2026

The Direct Answer

No, Main Clinic Supply is not an authorized Inogen dealer. We are not an authorized reseller for any portable oxygen concentrator manufacturer. We dropped every one of those agreements, deliberately, so that our only loyalty is to you.

Here is what we kept: active factory repair certifications for all leading portable oxygen concentrator brands. Our technicians hold the same certifications that manufacturer-employed technicians hold, backed by 14 years of daily hands-on repair experience in our Rochester, Minnesota service center. We know these machines inside and out because we have spent over a decade taking them apart and putting them back together.

Here is what we gained: total freedom to recommend the best device for your medical condition and your lifestyle. No manufacturer telling us what to recommend. No pages of restrictions dictating how we sell, what we say, or how we price. No pressure to push one brand over another. Just an honest conversation between you and an oxygen specialist who has been doing this for over 14 years.

And here is what we built that no authorized dealer offers: the MCS Gold-Standard Warranty, which includes accidental drop protection. No factory warranty in the industry covers drops. Ours does.

Factory-Certified Repair: The Credential That Matters

There are two types of credentials in the portable oxygen concentrator industry. One is a reseller agreement, which is a sales contract. The other is a repair certification, which is proof that your technicians can actually fix the equipment. We kept the one that matters to patients and dropped the one that only mattered to manufacturers.

Main Clinic Supply holds active factory repair certifications for all leading portable oxygen concentrator manufacturers where certification exists. That means our technicians have completed the manufacturer training programs, passed the assessments, and maintain the qualifications to diagnose, repair, and service these devices at the factory standard.

What Our Service Center Does

Our Rochester, Minnesota service center is led by Mark Luther, Chief Technology Officer and Certified Oxygen Specialist, with 14+ years dedicated to the technical service of portable oxygen concentrators. Mark and his team perform:

• Complete diagnostics across Inogen (Rove 6, Rove 4, G5, G4, G3), GCE, CAIRE, O2 Concepts, and Rhythm Healthcare platforms
• Sieve bed replacement to restore oxygen purity when columns degrade over time
• Battery diagnostics and replacement to verify true capacity versus rated capacity
• Firmware configuration to ensure device software is current and properly calibrated
• Preventative maintenance protocols designed by MCS to extend device lifespan beyond manufacturer estimates

We have repaired thousands of portable oxygen concentrators over 14 years in Rochester, Minnesota, a few minutes from the Mayo Clinic, serving patients across the United States and Canada. That is not a marketing claim. That is the daily work of our service bench.

Why We Dropped Every Authorized Reseller Agreement

We did not drop one manufacturer's reseller agreement. We dropped all of them. Every single one. This was not a reaction to any one company. It was a principled decision to put Main Clinic Supply in a position of total independence.

After 14 years of operating under authorized reseller agreements, we know exactly what those contracts contain. They are not partnerships. They are pages and pages of manufacturer restrictions that favor the manufacturer, not the patient and not the dealer.

What Those Restrictions Actually Look Like

When a dealer signs an authorized reseller agreement with a portable oxygen concentrator manufacturer, they typically agree to terms that can include:

• Brand-first recommendations: Pressure to prioritize the authorizing manufacturer's products even when a competitor's device may be a better fit for the patient's prescription, lifestyle, or budget
• Pricing restrictions: Limitations on how the dealer prices equipment, reducing the ability to pass savings to the customer
• Marketing restrictions: Rules governing how the dealer communicates, including limitations on what they can say about competing products
• Inventory requirements: Minimum purchase volumes that prioritize the manufacturer's revenue targets, not actual patient demand
• Branding requirements: Obligations to display manufacturer logos and branding in ways that benefit the manufacturer's market position

Every one of those restrictions exists to serve the manufacturer. None of them exist to serve the patient. And when the patient is someone making one of the most important purchases of their life, a device they will depend on every single day, those restrictions become an obstacle to doing the right thing.

So we removed the obstacle. All of them. For every brand.

What Total Independence Gives You

When you call Main Clinic Supply at 1-800-775-0942, the oxygen specialist on the phone has no manufacturer agreement influencing the conversation. They have exactly one priority: finding the right device for your condition and your lifestyle.

They will ask about your prescription level, your daily routine, your travel plans, your noise sensitivity, and your budget. The recommendation comes from your answers, not from any manufacturer's sales targets.

Sometimes the right device is an Inogen Rove 6. Sometimes it is a GCE Zen-O lite. Sometimes the best fit is a device you have never seen on television because the manufacturer does not spend millions on TV advertising. You will hear about all of them from us, because no manufacturer agreement is telling us what to recommend, what to say, or what to leave out.

The MCS Warranty: Beyond Factory Coverage

Every new portable oxygen concentrator purchased from Main Clinic Supply ships with the full manufacturer warranty, regardless of brand. We advocate on your behalf to ensure that factory warranty is upheld. If you have a warranty issue, you call us, and we handle it. You do not navigate the manufacturer's claims process alone.

But the factory warranty is just the starting point.

The MCS Gold-Standard Warranty

Main Clinic Supply offers its own warranty coverage that goes significantly beyond what any manufacturer provides. This is not a replacement for the factory warranty. It is an additional layer of protection built by a company that has spent 14 years understanding exactly how portable oxygen concentrators fail in real life and what patients actually need when they do.

Accidental Drop Protection

This is the coverage that separates Main Clinic Supply from every other dealer in the industry.

Portable oxygen concentrators go everywhere with you. They travel in cars, on airplanes, through airports, and around your home. They get bumped, jostled, and occasionally dropped. It happens. And when it does, the factory warranty does not cover it.

No manufacturer warranty in the portable oxygen concentrator industry covers accidental drops or falls. Not Inogen. Not GCE. Not CAIRE. Not any of them. Zero.

The MCS gold-standard warranty includes drop coverage. If your concentrator is damaged by an accidental drop, you are covered. This is the kind of real-world protection that only comes from a company that has spent 14 years listening to what actually goes wrong with these devices in patients' daily lives, and then building a warranty that actually addresses it.

Factory Warranty Advocacy

Even for standard factory warranty claims, MCS provides something most dealers do not: active advocacy. When you purchase from Main Clinic Supply and have a warranty issue, our team works directly with the manufacturer on your behalf. We know the warranty terms for every brand we sell. We know the claims process. We know how to document the issue so it gets resolved efficiently. You are not left to figure it out alone.

This is another advantage of having a factory-certified repair center on site. When we submit a warranty claim, it comes with a professional diagnosis from certified technicians who speak the manufacturer's technical language. That carries more weight than a customer describing a problem over the phone.

How We Compare

The table below compares the service and warranty experience at Main Clinic Supply versus what a typical authorized dealer or manufacturer-direct purchase provides. The portable oxygen concentrator itself is the same device regardless of where you buy it. The difference is what happens after you buy it, who is guiding your decision, and how well you are protected.

Frequently Asked Questions

Authoritative Resources

Were You Told Something About Main Clinic Supply? Warranty? Not Allowed to Sell Inogen? They Can't Service Inogen Machines? Anything They Told You That Was Negative About Main Clinic Supply?

What Customers Say About Main Clinic Supply

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Disclaimer: This information is for educational purposes only. Main Clinic Supply is an independent portable oxygen concentrator specialist that holds no authorized reseller agreement with any manufacturer. Product warranties are governed by manufacturer terms and the MCS service agreement; contact Main Clinic Supply at 1-800-775-0942 for complete warranty details. All manufacturer names and trademarks referenced on this page are the property of their respective owners. Main Clinic Supply is not affiliated with, endorsed by, or authorized as a reseller by any manufacturer mentioned. For medical advice, consult your physician. For Medicare coverage questions, contact your plan administrator.