• 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.

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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.

Cart 0

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

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20x24x1 AIRx ALLERGY Air Filter

AIRx 20x24x1-ALLERGYOur#: 194874
Made in USA
20x24x1 AIRx ALLERGY Air Filter
20x24x1 AIRx ALLERGY Air Filter
20x24x1 AIRx ALLERGY Air Filter
20x24x1 AIRx ALLERGY Air Filter
20x24x1 AIRx ALLERGY Air Filter
20x24x1 AIRx ALLERGY Air Filter
20x24x1 AIRx ALLERGY Air Filter
20x24x1 AIRx ALLERGY Air Filter
20x24x1 AIRx ALLERGY Air Filter
20x24x1 AIRx ALLERGY Air Filter
20x24x1 AIRx ALLERGY Air Filter
20x24x1 AIRx ALLERGY Air Filter
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

$27.99

$34.99
Code DF20 · Save 20%
$27.99 per filter
Code DF20 · Save 20%
SAVE 0% 1-pack

Pack Size

Filtration Level

Compare all →
In Stock, Ships onWednesday, Sep. 30th
Just $70.00 more for free shipping! Get this — more unlocks 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 × 24 × 1"
Actual Size
19 ½ × 23 7⁄16 × 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) 492 738 983 1229 983 * * 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)
492 0.09
738 0.13
983 0.19
1229 0.25
983 * 0.19 *
* Max Rated Airflow

Replaces These Filter

National Filter Sales

PF-02-202401-6

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

4.8 4.8 out of 5 stars
119 verified reviews
5★
(102)
4★
(12)
3★
(1)
2★
(2)
1★
(2)
5
4.8 / 5 (119)
Macario C. 107 days ago
5
Great product at a reasonable price I always purchase my filters from this vendor.
Lynda A. 159 days ago
5
When did ac filters become so expensive?
Ray P. 197 days ago
5
First time that I have bought these filters. Ordering was easy and I received them quickly. I have installed the first replacement filter and still evaluating it.
(User 3. 205 days ago
5
using it for years company reliable filters good
James E. 241 days ago
5
I have two return air vents that I inspect and change as needed and these filters are the best value for my money.
Jennifer 314 days ago
5
Seem to work very well, we have 2 dogs and the visitors say the house doesn't smell
Jerome H. 497 days ago
5
They are great.
Macario C. 616 days ago
5
Great filters I been using them for a couple years and they are worth the money in my opinion
Donald M. 720 days ago
5
Best price and shipping.
Barbara I. 735 days ago
5
Very affordable and good quality. Great customer service!
Karan B. 811 days ago
5
These allergy filters really help with my allergies!
frank m. 831 days ago
5
It is what I need and it does what I expect. I would only hope that further price increases are minimal.
Patriot 942 days ago
5
Good quality. Enjoying the fresh clean air with these allergy filters.
Dennis H. 982 days ago
5
Good product, good price and delivered right to my door.
gary m. 990 days ago
5
They do the job. They were a bit expensive but what isn’t these days. Shipping was quick.
Matt D. 1096 days ago
5
Good quality construction and good fit, especially for my odd size air returns. Happy to be buying from an American company that makes their products in the USA.
Gene U. 1136 days ago
5
Does a great job of keeping the air clean
Macario C. 1149 days ago
5
Great product for the money and will purchase it again. Highly recommended
Nettie M. 1166 days ago
5
Thank you so much for the reminder. Much easier to buy a box rather than one at a time.
PAUL 1393 days ago
5
Very good value
Sonja H. 1546 days ago
5
Great filters!!
Shafi A. 1672 days ago
5
The filters are good quality and reasonable price
P. M. 1705 days ago
5
Fast, convenient delivery. So far, so good. Product performs as expected.
Wayne H. 1756 days ago
5
Very easy to use the site and customer service was great in helping me when I ordered the wrong size air filters. Fast delivery also
Maciej S. 1776 days ago
5
Excellent quality fantastic service great price
Art C. 1810 days ago
5
A great filter for our photo studio keeping dust to a minimum is key and this filter does to job
Maggie F. 1812 days ago
5
Great service. Helpful reminders. Easy purchase process.
Dodge m. 1829 days ago
5
Good product
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