• 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.*

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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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13x21.5x1 AIRx ALLERGY Air Filter, 4-Pack

5
50 reviews
◆
 
Average rating 4.8/5
5 stars
(40)
4 stars
(9)
3 stars
(1)
2 stars
(0)
1 star
(0)
AIRx 13x21.5x1-ALLERGYOur#: 194287
Made in USA
13x21.5x1 AIRx ALLERGY Air Filter, 4-Pack
13x21.5x1 AIRx ALLERGY Air Filter, 4-Pack
13x21.5x1 AIRx ALLERGY Air Filter, 4-Pack
13x21.5x1 AIRx ALLERGY Air Filter, 4-Pack
13x21.5x1 AIRx ALLERGY Air Filter, 4-Pack
13x21.5x1 AIRx ALLERGY Air Filter, 4-Pack
13x21.5x1 AIRx ALLERGY Air Filter, 4-Pack
13x21.5x1 AIRx ALLERGY Air Filter, 4-Pack
13x21.5x1 AIRx ALLERGY Air Filter, 4-Pack
13x21.5x1 AIRx ALLERGY Air Filter, 4-Pack
13x21.5x1 AIRx ALLERGY Air Filter, 4-Pack
13x21.5x1 AIRx ALLERGY Air Filter, 4-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

$67.18

$83.98
Code DF20 · Save 20%
$16.80 per filter
Code DF20 · Save 20%
SAVE 0% 4-pack
In Stock, Ships onThursday, Oct. 1st
You're $70.00 away from free shipping! Buy this and you're only from free shipping! Buy this and your order ships free!

Orders over $70 ship free. $5.99 otherwise.

Your Order Ships Free!

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
13 × 21 ½ × 1"
Actual Size
13 × 21 ½ × ⅞"
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

Replaces These Filtersss

Bryant / Carrier

KFAFK0112SML

National Filter Sales

PF-02-13x21.5x01-6

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
50 verified reviews
5★
(40)
4★
(9)
3★
(1)
2★
(0)
1★
(0)
5
4.8 / 5 (50)
Peter M. 647 days ago
5
Great filter provider
Alan L. 733 days ago
5
The quality is much better than what I can purchase at a box store.
Paul S. 804 days ago
5
Again have bought this air filter for over two years. My size is hard to find, change mine every two months. Fair price good Good quality
Dixie P. 831 days ago
5
These filters are amazing! They keep my house at least 95% dust free! That is wonderful!
Michelle C. 901 days ago
5
Easy ordering and great value.
Mitchell S. 960 days ago
5
These filters have always been very good, I change every 60 days.
Paul S. 1871 days ago
5
Excellent product and value
Eduardo S. 2322 days ago
5
seems like a good product, have not installed yet but looks good to go.
Alan L. 2510 days ago
5
Best place to purchase nonstandard size AC filters.
CATHY M. 2568 days ago
5
I can get my hard to find air filter. These filters usually last 3 months before having to change them out. There's a place to write the date for changing your filter and arrow showing you the right direction for air flow. The usually buy 6 at a time so, I always have my filters on hand. I do get a reminder it's time to buy more filters.
Charles G. 2576 days ago
5
Perfect fit
art o. 2667 days ago
4
this is the only place to find this size . fits just tight
Cameron 2763 days ago
4
Works as advertised. It is made of paper and fiber so value is really difficult to rate. So, average with 3 stars.
Kevin 2794 days ago
4
One filter was coming apart when I opened the box, but other than that I am pleased with my purchase. It is a great price point for six filters and am glad they were in stock and shipped super fast!
John L. 2811 days ago
5
These filters are great, no allergies, very little dust and I will buy again when needed.
Carolyn S. 2875 days ago
5
Work great. Had a hard time finding the size I needed. Glad we found you. We recently ordered water filters for our KitchenAid refrigerator. Fit perfectly. Will be ordering other filters as I need them.
Pam 2924 days ago
5
I am always satisfied with Discount Filters and this product!
james h. 2926 days ago
5
I always deal with discountfilters.com. Very friendly and honest people. Never dissatisfied so far. Always on time delivery, and always willing to help with any questions.
Jeff R. 2952 days ago
5
The filters looked better constructed than the filters that were in the new house we purchased. Very happy with the quality
Roger L. 2953 days ago
5
A great discovery for my odd size furnace filter at a very good price. The filter fits perfect & is a much better one than my old washable filter. Will definitely order more from Discount Filters.
Tina C. 3118 days ago
5
They work great, haven’t needed to dust as much and price point was great! Also very quick shipping!
David E. 3257 days ago
5
My HVAC requires an odd size filter. The ones received work perfectly, Thanks.
Jeffrey W. 3432 days ago
5
Fit perfectly, excellent service, will be reordering water and air filters for my vacation home also
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