• 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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21.5x23.5x1 AIRx DUST Air Filter

AIRx 21.5x23.5x1-DUSTOur#: 194983
Made in USA
21.5x23.5x1 AIRx DUST Air Filter
21.5x23.5x1 AIRx DUST Air Filter
21.5x23.5x1 AIRx DUST Air Filter
21.5x23.5x1 AIRx DUST Air Filter
21.5x23.5x1 AIRx DUST Air Filter
21.5x23.5x1 AIRx DUST Air Filter
21.5x23.5x1 AIRx DUST Air Filter
21.5x23.5x1 AIRx DUST Air Filter
21.5x23.5x1 AIRx DUST Air Filter
21.5x23.5x1 AIRx DUST Air Filter
21.5x23.5x1 AIRx DUST Air Filter
21.5x23.5x1 AIRx DUST 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 protect your HVAC system, keep your house a little cleaner, and remove a few nuisance particles from the air you breathe then yes, this is the filter for you! Not everyone needs to get rid of odors, and not everyone is overly sensitive to allergens and other, more harmful, particulates in their air. We make shopping for air conditioner filters and furnace filters easy!
Entry-level pleated air filter offers improved filtration over common fiberglass filters
MERV 8 rating means the filter attracts common large household allergens like dust, pollen, and mold spores
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
In Stock, Ships onWednesday, Sep. 30th
Only $70.00 more for free shipping! Add this — just more for 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
21 ½ × 23 ½ × 1"
Actual Size
21 ½ × 23 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 Filters

Bryant / Carrier

KFAFK0412XXL

National Filter Sales

PF-01-21.5x23.5x01-6

About This Product

Is this the right air filter for you?

If you want to protect your HVAC system, keep your house a little cleaner, and remove a few nuisance particles from the air you breathe then yes, this is the filter for you!  Not everyone needs to get rid of odors, and not everyone is overly sensitive to allergens and other, more harmful, particulates in their air.  We make shopping for air conditioner filters and furnace filters easy!

  • Entry-level pleated air filter offers improved filtration over common fiberglass filters
  • MERV 8 rating means the filter attracts common large household allergens like dust, pollen, and mold spores
  • 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
58 verified reviews
5★
(47)
4★
(7)
3★
(3)
2★
(1)
1★
(0)
5
4.7 / 5 (58)
Irwin W. 41 days ago
5
The product itself is as advertised. This review is about the service. I recently received a shipment that was damaged during delivery. I emailed the seller and they immediately sent out another shipment. I'm sure everyone would agree that this expeditious communication and response to the issue was great service.
William M. 106 days ago
5
Quality product- easy to order - fast delivery
Kathy M. 467 days ago
4
Effective filters for my odd sized HVAC system.
J A. 688 days ago
5
Very good ordering process and timely delivery. We just put one in the A/C unit and it seems good.
Craig R. 825 days ago
5
Got perfectly.
James W. 1028 days ago
5
They should do the job. Filters everywhere with quality so so expensive.
William P. 1163 days ago
5
Great filtering capacity without blocking the AC/Furnace air flow as do many box store AC Filters.
Michael W. 1611 days ago
5
great product !!!
Stephen C. 1660 days ago
4
10 characters
Daniel R. 1729 days ago
5
Fantastic customer service. FedEx messed up the delivery, but DiscountFilters sent me some new air filters right away! Definitely would recommend this company.
Karl G. 1796 days ago
5
Great product
JACOB G. 1833 days ago
5
It works and is priced right
Thomas S. 1898 days ago
5
Very good filters for the money. Allows excellent air flow but traps the dust letting our air handler work without restricting it's efficiency.
James M. 1947 days ago
5
The filters themselves are fine. I am most impressed with the customer service! Thank you!!
Mark W. 2013 days ago
5
Quick and easy. I get all my filters from you - refrigerator and HVAC Mostly happy because you halted marketing emails as soon as i asked you to do so
Martha M. 2468 days ago
5
Excellent quality highly recommended by technician
Dennis O. 2482 days ago
5
Excellent filters shipped and arrived in perfect condition. Sizing is consistent throughout and they work as advertised.
Peter G. 2719 days ago
5
Product arrived quickly and fit perfectly
Walker 2719 days ago
5
Arrived well package and on time.
Nicholas V. 3001 days ago
5
I have been using the furnace filters for 8 years & change them every 4 months. They work out fine.
Michael F. 3051 days ago
5
When I bought my first case last year, for my Carrier system, I had no idea what MER meant. So I bought a case of filters with a MER of 11. As soon as I put the first one in, within s week my system told me to replace it. I was confused, but I did. A week later, the second filter according to the system said it needed to be replaced. I took it out and it looked clean. So discouraged, I put the original washable filter back in that came with the unit. So I did not use the remaining filters. Two months ago, they came to do the yearly service on the unit and I asked them why the brand new filters I bought did not work. I was informed that the unit I had required MER of 8 or less. So I went back and bought another case, only this time with a MER of 8. I put in the first filter and it has been a month and no issues. The moral of this is make sure you buy the right MER. At his company provide quality filters at a great price. I would recommend them to anyone looking for replacement filters.
Dennis O. 3372 days ago
4
The filters appear well constructed and of the correct MERV rating. The first one out of the box fit nearly perfectly. My HVAC appears to be working correctly and I'll know in a month when I replace this filter if it's done the job. At first glance, though, we seem to have significantly less dust in the house (and we share our home with a cat!) since using this filter.
Millsboro M. 3576 days ago
5
Great fit, good price...would recommend to a friend
James K. 3703 days ago
5
Fast service; better construction than the ones I used earlier.
Ivo K. 3741 days ago
5
Great customer service. Speedy delivery. Keep up the great work
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