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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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18x18x1 AIRx DUST Air Filter, 6-Pack

5
97 reviews
◆
 
Average rating 4.8/5
5 stars
(83)
4 stars
(11)
3 stars
(3)
2 stars
(0)
1 star
(0)
AIRx 18x18x1-DUSTOur#: 174647
Made in USA
18x18x1 AIRx DUST Air Filter, 6-Pack
18x18x1 AIRx DUST Air Filter, 6-Pack
18x18x1 AIRx DUST Air Filter, 6-Pack
18x18x1 AIRx DUST Air Filter, 6-Pack
18x18x1 AIRx DUST Air Filter, 6-Pack
18x18x1 AIRx DUST Air Filter, 6-Pack
18x18x1 AIRx DUST Air Filter, 6-Pack
18x18x1 AIRx DUST Air Filter, 6-Pack
18x18x1 AIRx DUST Air Filter, 6-Pack
18x18x1 AIRx DUST Air Filter, 6-Pack
18x18x1 AIRx DUST Air Filter, 6-Pack
18x18x1 AIRx DUST Air Filter, 6-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

$69.95

$87.44
Code DF20 · Save 20%
$11.66 per filter
Code DF20 · Save 20%
SAVE 58% 6-pack

Pack Size

Filtration Level

Compare all →
In Stock, Ships onMonday, Oct. 5th
$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
18 × 18 × 1"
Actual Size
17 ¾ × 17 ¾ × 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) 332 498 664 830 664 * * 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)
332 0.07
498 0.11
664 0.17
830 0.23
664 * 0.17 *
* Max Rated Airflow

Replaces These Filters

National Filter Sales

PF-01-181801-6

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
97 verified reviews
5★
(83)
4★
(11)
3★
(3)
2★
(0)
1★
(0)
5
4.8 / 5 (97)
George M. 41 days ago
5
Great product. Took 10 days to get them. Usually much sooner.
Sandra D. 162 days ago
5
Love the product, price and convenience!
Sondra W. 186 days ago
5
I used them at a previous house & always used them. Good for house with cats.
Cynthia E. 320 days ago
5
I keep ordering it because it serotonin do the job!
Eva R. 382 days ago
5
I have tried other filters we felt they didn’t filter the air as well discount filters are woven so well they absorbed dust,lint and all spores in the air
Carole N. 389 days ago
5
I appreciate the replacements. Great PR. They came in good condition.
Glen 402 days ago
5
Product doesn’t a good job. Delivery a might slow.
Eva R. 743 days ago
5
Traps dust and so much more it has the vented ridges I like this one because it’s supposed to help with viruses and bacteria we have been using this type of filter for over a year we are very pleased with it
zhibo l. 743 days ago
5
Excellent Product, reasonable priced. I have stopped buying my filters from other sources. Just online order from this vendor and I will have everything delivered to my door.
Robert P. 956 days ago
5
Perfect or my application in my workshop
Robert K. 1048 days ago
5
Well made, could not find this size at the big box store
TIFFANY B. 1075 days ago
5
Easy peasy lemon squeezy! I have been buying our filters from Discount Filters for a few years now. They make the ordering process so easy, a click! They will send you reminders when it’s time to re-order - don’t worry you can create your own schedule. For those of us who change their filters a little sooner than industry standards, you can create a custom order reminder or auto order. And yes I have found their prices to be competitive… I have checked big box stores and Amazon and they really are quite competitive. They arrive within days and typically faster than they estimate. Oh, they have odd sizes too for those odd balls out there. ?
Robert B. 1134 days ago
5
Your website is easy to use, and the filters are good
George M. 1201 days ago
5
My go to place for all my filters. Dependable products and good service.
J T. 1338 days ago
5
Great product and pricing as well as fast shipping.
Emarita L. 1670 days ago
5
I was very pleased with the speed of the filters. My first time ordering so I was nervous about it. My late husband made the previous purchase. Thank you.
Ernest S. 1787 days ago
5
Good product at a fair price and complete.....
Timothy R. 1853 days ago
5
Great service, Good Value
Carole N. 1857 days ago
5
The furnace filters arrived on time and in a good box. I can't find that size in my local store so I really appreciate being able to get them sent to my house.
Daniel D. 1932 days ago
5
Perfect product for the price
zhibo l. 2035 days ago
5
Quality and Value. I stopped buying filters from retail stores after I tried once with this online vendor. The filters are made with quality material and true size to fit, high quality and reasonable prices.
William E. 2035 days ago
5
Reliable service and quick delivery
Mary E. 2227 days ago
4
the product is good but your customer service is excellent.
robert b. 2432 days ago
5
Been using them for about 4 years - Happy with the product and Customer Service
Sandra D. 2444 days ago
5
I won't purchase my filters anywhere else! Great price, service, product and shipping!!
Carole N. 2479 days ago
5
I love your fast service for a hard to find filter.
CHERYL W. 2603 days ago
5
Fast shipping on a quality product
Robert G. 2680 days ago
5
Easy to install, does the job.
Francine W. 2732 days ago
5
Excellent
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