HSA/FSA Approved Air Purifiers

Experience the freedom of clean, comfortable air, from 30-40% Off.
Letter of Medical Necessity provided (typically $25+) free of charge.

Airdog X3 Air Purifier-up to 860 sq.ft.

Airdog X3 Air Purifier-up to 860 sq.ft.

For rooms up to 860 ft2

$369.00
$369.00 $449.00
Uncover pristine air with Airdog X3, a stylish, minimalist, small-footprint air purifier. 🍃 Airdog’s patented Two-pole Active Filtration Technology® (TPA)...
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Airdog MOI Mold-Free Evaporative Humidifier

Airdog MOI Mold-Free Evaporative Humidifier

$199.00
$199.00 $299.00
The World's First Mold-Free Evaporative Humidifier! Experience the power of cutting-edge cold evaporative technology, delivering consistent humidity without any mist...
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Airdog X5 Air Purifier-up to 1600 sq.ft.

Airdog X5 Air Purifier-up to 1600 sq.ft.

For rooms up to 1,600 ft2

$569.00
$569.00 $649.00
Breathe cleaner with the Airdog X5 Air Purifier with FDA clearance. Our advanced purification technology TPA®, destroys 99.9% of airborne...
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Airdog X8 Air Purifier-up to 4000 sq.ft.

Airdog X8 Air Purifier-up to 4000 sq.ft.

For rooms up to 4,000 ft2

$1,069.00
$1,069.00 $1,199.00
Unleash pure air faster than ever with our most advanced, app-enabled unit, Airdog X8 air purifier - a Silicon Valley...
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Aircap Portable Air Purifier

Aircap Portable Air Purifier

For your car, truck, office, bedroom, or gym.

$149.00
$149.00 $249.00
Breathe better, and live healthier with Aircap! This small but mighty air purifier, powered by Airdog's TPA® technology, not only...
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Airdog Pet Air Purifier-up to 1600 sq.ft.

Airdog Pet Air Purifier-up to 1600 sq.ft.

$599.00
$599.00 $699.00
Designed with pets in mind, Airdog pet air purifier addresses the unique needs of pet households. Imagine the relief from...
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How it Works:

  • 01

    If you have a "Shop" account logged in, make sure you checkout as guest as shown above

  • 02

    At checkout, under “Payment” select Flex | Pay with HSA/FSA

  • Screen with 'I Agree' button for authorization and consent on a white background

    03

    Provide your consent to a questionnaire for "Letter of Medical Necessities" (essential for reimbursement)

  • 04

    Provide your payment method, and if qualified, a Letter of Medical Necessity will be emailed to you to submit for reimbursement proof

Invest in better health

Many people don’t realize that certain air purifiers may qualify as medical expenses under HSA or FSA guidelines. If a device is used to alleviate or prevent a medical condition, it can often be purchased using these pre-tax funds—which can help reduce your taxable income. Airdog air purifiers are designed to improve indoor air quality by capturing airborne particles such as dust, pollen, and bacteria. This cleaner air can support respiratory health and help create a safer environment for those with allergies, asthma, or other sensitivities. Using HSA or FSA funds for an eligible air purifier is a smart way to invest in your well-being while making the most of your health benefits. Shop FSA and HSA-eligible products!

How Airdog Works to Deliver Cleaner, Healthier Air with HSA/FSA Benefits

  • 1. Advanced Air Filter Technology

    Airdog air purifiers use a patented TPA® system instead of traditional HEPA filters. This technology generates a high-voltage electrostatic field to attract and destroy airborne particles. Unlike HEPA filters, which can clog and degrade over time, Airdog’s washable, reusable air filter plates maintain consistent performance while cutting down on waste and replacement costs.

  • 2. A Health-Focused Investment

    When used to manage conditions like allergies or asthma, an air purifier may qualify as an eligible healthcare expense under many HSA or FSA plans. Because Airdog purifiers help reduce exposure to airborne triggers, they can support respiratory health and overall wellness. Before making a purchase, speak with your healthcare provider or plan administrator to confirm your HSA or FSA options.

  • 3. Support for Your Immune System

    Cleaner air reduces the burden on your lungs and helps protect your immune system from constant exposure to indoor pollutants. Airdog purifiers remove harmful particles like smoke, dust, mold spores, and bacteria, down to 0.0146 microns. This helps create a safer environment for individuals with sensitivities or weakened immune systems, especially in homes with pets, young children, or frequent visitors.

  • 4. Enjoy Peace of Mind

    Airdog purifiers are designed to work hard in the background, so you can focus on living. The reusable filter system maintains high performance while keeping maintenance low. With fewer particles in the air and no ongoing filter subscriptions to manage, it’s easy to enjoy peace in your space. Just clean the plates, power the unit back on, and breathe easier every day.

Letter of Medical Necessity FAQs

Below are common questions related to your Letter of Medical Necessity.

What is a Letter of Medical Necessity?

Some products require documentation from a licensed healthcare provider stating that the item is necessary to treat or manage a specific medical condition. If the product requires a Letter of Medical Necessity (LOMN), Flex facilitates a chat-based consultation that generates the Letter in real time.

Why do I need to provide Airdog with health information?

In order to qualify to use your HSA or FSA card for an Airdog product, the IRS requires you to have a Letter of Medical Necessity. Airdog has partnered with Flex to enable asynchronous telehealth visits as part of our checkout. Within 24 hours of your purchase, Flex will email you both an itemized receipt.

Do I need to do anything with my Letter of Medical Necessity?

You should keep it on file for at least three years in the event of an IRS audit of your HSA or FSA account. Occasionally, FSAs may ask for the Letter to confirm the eligibility of your purchase.

Help! I mistakenly entered my name and/or date of birth and need to get an updated letter. Who can I reach out to?

Please email support@withflex.comand they will reach out to their telehealth team to reprocess and send your corrected Letter of Medical Necessity.

The date on my Letter of Medical Necessity is one day different from my receipt.

Thanks for letting us know! This may be a time zone issue. We’ll reach out to our partners at Flex to see if they can reissue the Letter with an updated date.

My FSA says I need a product name, NPI number, other info added to my Letter for approval.

Generally, we’re not able to accommodate one-off requests, but we will reach out to our partners at Flex and see if we can accommodate your request.

Help! I did not receive an itemized receipt and/or Letter of Medical Necessity from Flex. What should I do?


Please check your spam folder, as sometimes emails from notifications@withflex.commay be automatically filtered as spam by some email service providers. If you still can’t find it, please email support@withflex.comand let them know the email address associated with your order.

HSA/FSA reimbursement questions

Below are common questions related to the reimbursement process of your HSA/FSA claims

My HSA/FSA claim was denied. What should I do?

We strongly recommend checking with your HSA/FSA provider to see if a purchase is eligible prior to completing the purchase. However, if you believe your claim has been wrongly denied, please send over any response from your HSA/FSA provider to us so we can share it with Flex and receive guidance on the next best steps to take. Please note that employer-sponsored FSAs can determine what products are eligible beyond the IRS’s guidelines, so it’s extremely important to check prior to purchase.

Can a customer purchase a product now and apply for FSA reimbursement in the next calendar year?

The ability to apply for FSA reimbursement in a future calendar year depends on the policy of the specific FSA provider. Most FSA administrators require that the purchase be made during the time of coverage. For example, if the FSA coverage is for 2025, all purchases typically need to be made and/or submitted for reimbursement within that coverage period.However, some administrators may have more flexible rules regarding the timing of when the expense occurred. We recommend that customers review their plan policy to confirm the details.

Note: Health Savings Accounts (HSAs) are different and generally allow for reimbursement at any time, even in future years.

Can old (non-Flex) customers use their order confirmation email to apply for HSA/FSA reimbursement?

Unfortunately, for purchases made without using Flex in the checkout to receive an itemized receipt, it may be difficult to apply for reimbursement.For Health Savings Accounts (HSAs), consumers can use an itemized receipt for reimbursement anytime after they have made the purchase, even if it is many years later.For Flexible Spending Accounts (FSAs), most accounts require that the purchase was made in the calendar year during which the consumer had the FSA, as FSAs typically do not roll over. Some FSAs offer a buffer window, allowing customers additional time to submit receipts for expenses incurred during the previous calendar year.

General HSA/FSA FAQs

Below are common questions related to HSA/FSA payments.

What is Flex and what is their relationship with Airdog?

Airdog has partnered with Flex to allow you to use your Health Savings Account (HSA) or Flexible Spending Account (FSA). This means you can now use your HSA or FSA debit card to buy Airdog products with pre-tax dollars, resulting in net savings of 30-40%, depending on your tax bracket.

How do I pay with my HSA or FSA card?

To use your HSA or FSA debit card, add products to your cart as usual. At checkout, select “Flex | Pay with HSA/FSA” as your payment option, enter your HSA or FSA debit card, and complete your checkout as usual. If you don’t see “Flex | Pay with HSA/FSA,” you may be in Shop Pay. Select “checkout as guest” to view more payment options.

What if I don’t have my HSA/FSA card available?

If you don’t have your HSA or FSA card handy, still select “Flex | Pay with HSA/FSA” as your payment method. Enter your credit card information and Flex will email you an itemized receipt to submit for reimbursement.

Why can’t I see Flex as a payment method?

The key here is to make sure you are logged out of ShopPay. One of the easiest ways to do this is to go through checkout in an incognito window.

Why is my HSA/FSA card being declined?

HSA/FSA cards are debit cards, and the most common reason for declines is insufficient funds. Reach out to your HSA/FSA administrator to confirm your balance.

I submitted my Flex itemized receipt for reimbursement and my FSA requires more information.

Please forward us the request from your FSA, and we will work with the Flex team to issue you a new receipt.

Help! I didn’t receive an email from Flex with my itemized receipt and/or letter of medical necessity. What should I do?

Please check your spam folder, as sometimes emails from notifications@withflex.com may be automatically filtered as spam by some email service providers. If you still can’t find it, please email support@withflex.com and let them know the email address associated with your order.

I would like to use multiple HSA/FSA cards to pay for an item. Can I do that?

No, unfortunately, this isn't a supported feature right now. If there are insufficient funds in a single HSA or FSA account, you can instead enter a credit card on the Flex checkout page. You will receive an itemized receipt and/or Letter of Medical Necessity from Flex, which you can submit for reimbursement.

My purchase receipt from Airdog has a different number than what my FSA was charged. How can we resolve it?


Thanks for reaching out, and apologies for the discrepancy. We'll review the charges and get back to you with details of the likely refund shortly.

Is sales tax covered by HSA/FSA funds, or is it treated separately?

Sales tax for eligible items is also covered by HSA/FSA funds. If the customer has a split cart, the tax will be divided among the cards based on the items.