Have an account? Log in to check out faster.
AirDoctor 4000 Replacement Filter
AirDoctor's 3-Stage filtration with our UltraHEPA® and Premium Carbon/VOC layers is designed to capture fine and ultra-fine airborne contaminants like pollen, mold spores, pet dander, smoke, and bacteria and viruses; and gases, VOCs and odor.. We recommend replacing your AD4000 filter every 6 months.
Fits all AD4000 models.
AirDoctor captures 99.99% of airborne particles.
Pet dander
Dust
Volatile organic compounds
Toxic gases
Mold spores
Pollen
Viruses & bacteria
Smoke
Premium air purification with UltraHEPA®
Captures particles 100x smaller than the HEPA standard.
We take over 20,000 breaths per day, inhaling whatever pollutants are in our environment. Even when you’re “safe” at home your health is at risk.
Not only does outdoor pollution make its way inside, there are many indoor sources of air pollution too, including stoves, cleaning products, and building materials. In fact, the Environmental Protection Agency (EPA) says indoor air can be 5x–100x more polluted than outdoor air!
Now the good news. AirDoctor’s UltraHEPA filter removes virtually 100% of airborne contaminants as small as 0.003 microns—that’s 100x smaller than the HEPA standard.
Capture the airborne contaminants hiding in your home’s air and take control of your air quality with AirDoctor.
Inside our Premium Carbon/VOC Filter
Remove the toxic gases most air purifiers miss.
HEPA-only air purifiers only do half the job. They remove harmful particles, but do nothing to protect you from toxic gases and volatile organic compounds (VOCs):
Our premium carbon filter enhanced with potassium permanganate (KMnO₄) is the answer. The activated carbon traps gases and VOCs, and the KMnO₄ converts them into stable, non-hazardous by-products.
Get full-spectrum protection with AirDoctor.
Overall rating: 4.826087 / 5 from 23 reviews.
Review topics: ["filters","air doctor","brand","unit"].
"This air filter has saved us. Living in New England we have a long cold season in which the house is closed up and all of the indoor allergens are closed up with us. We have had a history of mold in the house we are in and we have four kids so between germs and must we have had many winter sniffles. This is our first year with our air purifier and we have had a significant reduction in sickness in our house."
"It's been great I've had it for over a month or so does everything needs to do I had another name brand that I've used for years and I put it in another room this one really works good for me"
"I added this model to take care of my upstairs area. It does a wonderful job of keeping air clean. My sinus problems are dramatically improved!"
"I had to return this filter - ordered the wrong one. Your rep made it easy to do - thanks! Now, I have to call and order a replacement filter for the 1000, not the 4000."
"Seems like a quality product, hard to tell really. Seems very expensive compared to other air filters."
"I love this model and filter"
"I haven’t used the replacement filter bc I have not had my AirDoctor long enough to use the replacement."
"Love Airdoctor but not name how expensive this filter is. Unfortunately I have turned away from buying this brand now because of the expense of this filter."
"Good replacement filter only 4 stars cause bit on the pricey side"
"Bought an extra one at time of purchase and the machine has not responded to replace it ,"
Frequently Asked Questions
Air changes per hour (ACH) refers to how many times the air is changed with new, clean air in a given space within the span of an hour. A Harvard University Study cited by the CDC recommends at least 4 air changes per hour to effectively remove allergens like smoke, bacteria, viruses, dust, and pollen.
CADR, or Clean Air Delivery Rate, refers to your air purifier’s efficiency in removing these three contaminants over time: pollen, dust, and smoke. Higher CADR numbers indicate better air cleaning performance. The smoke CADR number is most stringent, reflecting the unit’s ability to eliminate the smallest and most dangerous particles from your indoor air.
Great question! Choosing the right air purifier will depend on the size of your room and the air circulations per hour. According to the Harvard University study, 4 air changes per hour are recommended for optimal purification. AirDoctor units are designed to meet this standard.
AirDoctor 1000: Replace UltraHEPA® and Carbon/VOC filters every 6 months.
All other AirDoctor units:
The indicator light on your AirDoctor will also light on when it’s time to replace your filter
– no more guesswork!
We stand behind the quality of our products. That’s why we offer a 30-day money-back guarantee on all purchases. If for any reason you’re not completely satisfied with your AirDoctor, simply reach out to our friendly customer service team at 1-800-221-2515, and we’ll gladly issue you a full refund, minus shipping and processing fees.
Yes! If you’re interested in a payment plan option, just select the Affirm payment option at checkout and follow the instructions. Terms and conditions apply.**
**Various purchase plans are available based on approval. Regretfully, Affirm is NOT available in Iowa or West Virginia due to state-specific financial regulations.
Yes! We've partnered with Truemed to make it easy for you to get reimbursed for your AirDoctor products using your HSA or FSA funds.
To see if you qualify, follow the steps below after making your purchase:
1) Fill out the short intake form from Truemed to check your eligibility. You'll find the link to the form in your AirDoctor order confirmation email.
2) If approved, Truemed will email you a Letter of Medical Necessity within 24 hours.
3) Send this letter, along with your order confirmation receipt, to your HSA/FSA provider for reimbursement.
It's that simple!
