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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 DUST Air Filter, 4-Pack

5
403 reviews
◆
 
Average rating 4.8/5
5 stars
(354)
4 stars
(34)
3 stars
(6)
2 stars
(1)
1 star
(8)
AIRx 20x20x1-DUSTOur#: 193878
Made in USA
20x20x1 AIRx DUST Air Filter, 4-Pack
20x20x1 AIRx DUST Air Filter, 4-Pack
20x20x1 AIRx DUST Air Filter, 4-Pack
20x20x1 AIRx DUST Air Filter, 4-Pack
20x20x1 AIRx DUST Air Filter, 4-Pack
20x20x1 AIRx DUST Air Filter, 4-Pack
20x20x1 AIRx DUST Air Filter, 4-Pack
20x20x1 AIRx DUST 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 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

$54.95

$68.69
Code DF20 · Save 20%
$13.74 per filter
Code DF20 · Save 20%
SAVE 45% 4-pack

Pack Size

Filtration Level

Compare all →
In Stock, Ships onTuesday, Sep. 29th
$70.00 more gets you free shipping! This puts you within of 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
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
8 17 50 70 Initial Resistance (IWC) 0.07 0.11 0.17 0.23 0.17 *
MERV
8
(µm) PSE (%)
0.3-1.0 17
1.0-3.0 50
3.0-10 70
Airflow Rate (CFM) Initial Resistance (IWC)
410 0.07
615 0.11
819 0.17
1024 0.23
819 * 0.17 *
* Max Rated Airflow

Replaces These Filter

National Filter Sales

PF-01-202001-6

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

4.8 4.8 out of 5 stars
403 verified reviews
5★
(354)
4★
(34)
3★
(6)
2★
(1)
1★
(8)
5
4.8 / 5 (403)
Cheryl K. 19 days ago
5
i Like the buying on line enough to last several months.
Joseph R. 27 days ago
5
Great filter, well made, all at a great price.
William 89 days ago
5
Fits our new system perfectly and arrived fast
Rick 93 days ago
5
I am only putting 1 star because when my system comes on, I can hear it pulling up the filter which is annoying. When the system turns off it releases the filter which I can also hear and is also annoying. If you don't mind the noise these filters will work just fine. I don't like the noise they make so I pulled them out.
Judith K. 98 days ago
5
Excellent product at a good price and shipped quickly.
Ed D. 145 days ago
5
THEY FIT PERFECTLY
Ray G. 154 days ago
5
Great filter. Reasonable price. Filters all I need for it to do.
Christopher 168 days ago
5
They trap the dust extremely well and fit great good product
GIBBS P. 194 days ago
5
quallity product
Ron J. 247 days ago
5
Excellent filter.
Linda R. 271 days ago
5
This filter works perfectly in my condo unit, change it every three months, it's a great value and an easy way to keep your environment clean and healthy. I have them on 90-day auto send, and they arrive exactly when I need them.
John R. 283 days ago
5
Good quality, excellent dust collection great price
Ken G. 286 days ago
5
great buy
Alan R. 289 days ago
5
Very easy to use and they fit perfectly in my furnace.
Maurice W. 294 days ago
5
Everything was perfect
Maria N. 297 days ago
5
I like it a lot and have been using it for years
Leon W. 297 days ago
5
Excellent product Prompt service
Joyce S. 300 days ago
5
Excellent value and product. I will be ordering from Discount Filters for my furnace filters from now on. I wish I would have discovered you sooner. I told my family members about you. They were excited to hear how much they could save also. Thanks
William M. 309 days ago
5
Does the job
angelo R. 310 days ago
5
Great product for your value Excellent service and get what u ask for
CHARLIE L. 316 days ago
5
Fast service with a great price and a great filter
Dennis 325 days ago
5
???????????
JOSEPH D. 329 days ago
5
I believe these are effective when changed every 6 weeks or less. Seems to be a good value for the cost.
Ronald H. 337 days ago
5
Fantastic Filters
Love 340 days ago
5
Happy with purchase. I am a repeat purchaser.
Klaus B. 343 days ago
5
have been using for years GREAT service
Linda K. 388 days ago
5
They are great. Easy to order
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