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  • Every order is carefully packed and shipped by our team in Indiana. Your purchase helps support American jobs and hardworking families right here in the Midwest. Our AIRx Furnace / AC Filters and ClearChoice Fridge Filters are made in the USA.

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  • Spend $70 or more and your order ships free! We'll get your filters out the door fast so you can enjoy clean air and water.*

    * Orders under $70 ship for $5.99.

  • Shop with confidence! If you're not completely satisfied with your purchase, you have up to one year to return it for a refund or exchange. We stand behind every filter we sell.

    Learn More

  • Every order is carefully packed and shipped by our team in Indiana. Your purchase helps support American jobs and hardworking families right here in the Midwest. Our AIRx Furnace / AC Filters and ClearChoice Fridge Filters are made in the USA.

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We don't know what's in your water,
but we know there's nothing in your cart.

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20x20x1 AIRx ALLERGY Air Filter, 12-Pack

5
598 reviews
◆
 
Average rating 4.7/5
5 stars
(498)
4 stars
(70)
3 stars
(14)
2 stars
(5)
1 star
(11)
AIRx 20x20x1-ALLERGYOur#: 181365
Made in USA
20x20x1 AIRx ALLERGY Air Filter, 12-Pack
20x20x1 AIRx ALLERGY Air Filter, 12-Pack
20x20x1 AIRx ALLERGY Air Filter, 12-Pack
20x20x1 AIRx ALLERGY Air Filter, 12-Pack
20x20x1 AIRx ALLERGY Air Filter, 12-Pack
20x20x1 AIRx ALLERGY Air Filter, 12-Pack
20x20x1 AIRx ALLERGY Air Filter, 12-Pack
20x20x1 AIRx ALLERGY Air Filter, 12-Pack
Compatibility guarantee — Wrong fit or not happy - we'll make it right, up to a whole year
Change every 3 months
Change every 3 months Swap on schedule for best performance
Made with pride in Greenwood, Indiana
Made with pride in Greenwood, Indiana Your purchase supports American jobs
MERV
MERV Find your ideal filtration level
Compatibility guarantee
Compatibility guarantee Wrong fit or not happy - we'll make it right, up to a whole year

Filter Description

If you want to promote superior air quality in your home, this is the air filter for you! The specialized media in the filter attracts and captures small particles that can cause allergies. We carry your size of air conditioner filter or furnace filter. We offer convenient online ordering and quick shipping right to your door!
Pleated media provides extended surface area for filtration, and low resistance to airflow
MERV 11 rating means the filter attracts household allergens like dust, pollen, mold spores, dander, smoke and smog
Replace every 90 days under normal use
Made with pride in the USA
100% free returns on all filters

$129.95

$162.44
Code DF20 · Save 20%
$10.83 per filter
Code DF20 · Save 20%
SAVE 57% 12-pack

Pack Size

Filtration Level

Compare all →
In Stock, Ships onTuesday, Sep. 29th
Add $70.00 more to unlock free shipping! Add this and you're just from free shipping! Buy this and your order ships free!

Orders over $70 ship free. $5.99 otherwise.

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Compare Side-by-Side

MERV Filter Comparison

Choose the filtration level that fits your home — then tap Select to update your cart above.

MERV 8
Standard
DUST
RECOMMENDED
MERV 11
Superior
ALLERGY
OPTIMAL
MERV 13
Optimal
HEALTH
Best For
STANDARD
Residential / Commercial
Healthy Families
SUPERIOR
Residential / Commercial
Allergy Sufferers
OPTIMAL
Residential / Commercial
Premium Protection
Comparable
Ratings		 MPR 600 & FPR 5 MPR 1000–1200 & FPR 7 MPR 1500–1900 & FPR 10
Filtration Captures ≥90% of large particles Captures ≥95% of large particles Captures ≥98% of large particles
Dust, Lint & Debris
Mold, Pollen
Dander, Dust Mites
Smoke & Smog
Bacteria
Odor, VOCs
Your
Filter
MERV 8
Standard
DUST
Best For Residential / Commercial, Healthy Families
Comparable MPR 600 & FPR 5
Filtration Captures ≥90% of large particles
Dust, Lint & Debris
Mold, Pollen
Dander, Dust Mites
Smoke & Smog
Bacteria
Odor, VOCs
RECOMMENDED
MERV 11
Superior
ALLERGY
Best For Residential / Commercial, Allergy Sufferers
Comparable MPR 1000–1200 & FPR 7
Filtration Captures ≥95% of large particles
Dust, Lint & Debris
Mold, Pollen
Dander, Dust Mites
Smoke & Smog
Bacteria
Odor, VOCs
OPTIMAL
MERV 13
Optimal
HEALTH
Best For Residential / Commercial, Premium Protection
Comparable MPR 1500–1900 & FPR 10
Filtration Captures ≥98% of large particles
Dust, Lint & Debris
Mold, Pollen
Dander, Dust Mites
Smoke & Smog
Bacteria
Odor, VOCs

Swipe or use arrows · tap to select

MERV (Minimum Efficiency Reporting Value) is an ASHRAE industry standard for measuring air filter efficiency.

Compatibility guarantee

Wrong fit, leak, or just doesn’t work? We’ll send the right one. Free return shipping for all orders.

365-day satisfaction

Not happy? Send it back any time in the first year — we’ll make it right. Yes, even an open pack you’ve been running for months.

No-hassle returns

No restocking fees, no return-merch authorization mazes — just start a return and our helpful Customer Experience team will assist.

Filter Maintenance

Is it time to change your Filter?

Generally, we recommend you replace your air filters every 90 days. Find out below if you should change your filters more often.

If someone in your home has asthma or allergies change your filter every

6 Weeks

to ensure indoor air quality is at its best.

If you have pets change your filter every

2 Months

to avoid shedding and odor buildup.

If you have young children change your filter every

2–3 Months

as having clean air is even more important with children in your home.

Filter Specifications

What does this filter remove?

Filtration capabilities
Nominal Size
20 × 20 × 1"
Actual Size
19 ½ × 19 ½ × ¾"
Filter Media
Electrostatically charged 100% synthetic gradient media that does not support microbiological growth
Filter Support Grid
30 gauge galvanized expanded metal grid
Frame
Moisture resistant double-wall beverage board
Max Temperature
180F (82C) continuous service, peak 225F (107C)
Max Humidity
Resistant to 100% R.H.
Initial Resistance
0.18" WC
Rated Velocity
295 FPM

Performance Testing

Performance Rating

MERV (µm) PSE (%) 0.3-1.0 1.0-3.0 3.0-10 Airflow Rate (CFM) 410 615 819 1024 819 * * Max Rated Airflow
11 29 68 86 Initial Resistance (IWC) 0.09 0.13 0.19 0.25 0.19 *
MERV
11
(µm) PSE (%)
0.3-1.0 29
1.0-3.0 68
3.0-10 86
Airflow Rate (CFM) Initial Resistance (IWC)
410 0.09
615 0.13
819 0.19
1024 0.25
819 * 0.19 *
* Max Rated Airflow

Replaces These Filter

National Filter Sales

PF-02-202001-6

About This Product

Is this the right air filter for you?

If you want to promote superior air quality in your home, this is the air filter for you!   The specialized media in the filter attracts and captures small particles that can cause allergies.   We carry your size of air conditioner filter or furnace filter.  We offer convenient online ordering and quick shipping right to your door!

  • Pleated media provides extended surface area for filtration, and low resistance to airflow
  • MERV 11 rating means the filter attracts household allergens like dust, pollen, mold spores, dander, smoke and smog
  • Replace every 90 days under normal use
  • Made with pride in the USA
  • 100% free returns on all filters

Customer Reviews

4.7 4.7 out of 5 stars
598 verified reviews
5★
(498)
4★
(70)
3★
(14)
2★
(5)
1★
(11)
5
4.7 / 5 (598)
Patricia D. 32 days ago
5
I have used these filters for a year, and like them very much.
Robert F. 58 days ago
5
Very good product and price is right, Just as good or better than ones bought in big box stores .
Matt O. 84 days ago
5
Great filters at a fabulous price compared to the big box stores.
Bonnie D. 89 days ago
5
I order a years worth of filters when they are having a sale. It makes it easy to change out the filters when ever we need to. The filters always arrive in great shape and a timely manner.
Alvin B. 119 days ago
5
Fits better than orginal filter
Gary 131 days ago
5
Great price, as good as named brand filters. Fast delivery, packaged well.
Alma G. 133 days ago
5
So far, so good! Very satisfied with the product. Glad I chose the Merv 11; seems to be very efficient!
John C. 135 days ago
5
Excellent product with an affordable price. I will continue to order my filters through Discount Filters.
mhtampa 175 days ago
5
I’m very satisfied with my purchase. Great product, works as described, received on time and was well packaged.
Catherine C. 235 days ago
5
The ease of use.
Kenneth L. 245 days ago
5
I have been buying all my filters (air, water, fridge) from Discount Filters for many years are they are quality filters at a reasonable price.
John B. 267 days ago
5
It works fine.
James C. 274 days ago
5
Will buy again
Steve C. 282 days ago
5
I have used these filters for a while. Good product & reasonable prices!
Linda B. 286 days ago
5
long time customer says it all....Thank you and have a Merry Christmas and Happy New Year.
Peter J. 296 days ago
5
High quality air filters and shipped quickly.
Becky 300 days ago
5
Perfect product for my needs! Delivered in a timely manner.
Paul S. 317 days ago
5
Better made than the HW store alternatives. The cardboard edge is stiff and more precisely measured. Fits opening well. Other filters were frequently a force fit.
Roger 328 days ago
5
Arrived promptly. Good value. Great filters
Wayne T. 356 days ago
5
They always have been and still are fantastic high quality and very reasonably priced with super fast shipping too makes them my choice and recommend to all others too. Thank you very much appreciate all you do to help us.
Gary B. 381 days ago
5
great customer service
William K. 410 days ago
5
The quality is excellent and again I've been using for years and again like everything else they have greatly increase in price , there deliver keep saying will be delivered the next day but they took 8 next days before arrival .
Brenda 422 days ago
5
Works great for my allergies.
Clyde 425 days ago
5
Good service& quality.
Austin D. 425 days ago
5
filters are well constructed and I have used these filters in a residential a/c system which runs 24/7 during the south Florida cooling season (which has turned into about 10 months this year). filters were shipped promptly and well packaged- no damage noted during shipping. highly recommended product and company!
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