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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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20x36x1 AIRx ALLERGY Air Filter - MERV 11

5
34 reviews
◆
 
Average rating 4.9/5
5 stars
(30)
4 stars
(4)
3 stars
(0)
2 stars
(0)
1 star
(0)
AIRx 20x36x1-ALLERGYOur#: 182021
Made in USA
20x36x1 AIRx ALLERGY Air Filter - MERV 11
20x36x1 AIRx ALLERGY Air Filter - MERV 11
20x36x1 AIRx ALLERGY Air Filter - MERV 11
20x36x1 AIRx ALLERGY Air Filter - MERV 11
20x36x1 AIRx ALLERGY Air Filter - MERV 11
20x36x1 AIRx ALLERGY Air Filter - MERV 11
20x36x1 AIRx ALLERGY Air Filter - MERV 11
20x36x1 AIRx ALLERGY Air Filter - MERV 11
20x36x1 AIRx ALLERGY Air Filter - MERV 11
20x36x1 AIRx ALLERGY Air Filter - MERV 11
20x36x1 AIRx ALLERGY Air Filter - MERV 11
20x36x1 AIRx ALLERGY Air Filter - MERV 11
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

$215.88

$269.85
Code DF20 · Save 20%
$17.99 per filter
Code DF20 · Save 20%
SAVE 15% 12-pack

Pack Size

Filtration Level

Compare all →
In Stock, Ships onTuesday, Sep. 29th
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 × 36 × 1"
Actual Size
19 ½ × 35 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) 738 1106 1475 1844 1475 * * 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)
738 0.09
1106 0.13
1475 0.19
1844 0.25
1475 * 0.19 *
* Max Rated Airflow

Replaces These Filter

National Filter Sales

PF-02-203601-6

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

4.9 4.9 out of 5 stars
34 verified reviews
5★
(30)
4★
(4)
3★
(0)
2★
(0)
1★
(0)
5
4.9 / 5 (34)
Kirk B. 284 days ago
5
Great filters
Kirk B. 467 days ago
5
Great filters atva Great price.
Kenneth V. 744 days ago
5
You always offer a very good product at at good price...The 30% discount really helped this time...Thank you very much..Weare long time customers..
Kirk B. 812 days ago
5
Great filters
Dale S. 1331 days ago
5
Excellent quality
customer 1578 days ago
5
Good product. Will buy again.
JACQUES G. 1727 days ago
5
The filters were exactly right and they arrived quickly and we’ll packaged.
RONALD B. 1761 days ago
5
Excellent product for the money.
George 1838 days ago
5
The air filters were as described on your website. Online shopping was easy and the applicable promotional discount was applied automatically. The items arrived in good condition. However, delivery by FedEX/SmartPost was slow. Not your fault but I just want you to know that has been my recent experience with this carrier.
Virginia S. 1975 days ago
5
............
John T. 2293 days ago
4
4 might be an underrating. Fast service and a good price. I have only had these installed for a couple of days so I don't know if they work well. I do suffer from allergies so if I don't end up with sneezing and other symptoms soon, I will bump this to a 5 star.
Yvonne 2598 days ago
5
Works very well thank you
Mark 2668 days ago
5
Great quality and at a nice price point. Delivery quick and free.
Pat M. 2738 days ago
5
These are good quality filters and a good price. They shipped quickly.
Everett D. 2804 days ago
5
Good quick service and good price
Ross V. 2837 days ago
5
This size air filter can be difficult to find in some stores so I’m glad to find it here for a good price.
Cheryl S. 2952 days ago
5
Have been ordering for 6 years, great product. Love the emails to remind me to change the filters. Hope you stay around for a long time, you are the best.
Jayna M. 3659 days ago
5
I have bad allergies and these filters really help out with cutting the dust, pollen, pet dander, etc.
David H. 3668 days ago
5
Received as advertised. Great price for a hard to find size anywhere else. Will purchase again.
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