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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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16.375x21.5x1 AIRx DUST Air Filter

AIRx 16.375x21.5x1-DUSTOur#: 194504
Made in USA
16.375x21.5x1 AIRx DUST Air Filter
16.375x21.5x1 AIRx DUST Air Filter
16.375x21.5x1 AIRx DUST Air Filter
16.375x21.5x1 AIRx DUST Air Filter
16.375x21.5x1 AIRx DUST Air Filter
16.375x21.5x1 AIRx DUST Air Filter
16.375x21.5x1 AIRx DUST Air Filter
16.375x21.5x1 AIRx DUST Air Filter
16.375x21.5x1 AIRx DUST Air Filter
16.375x21.5x1 AIRx DUST Air Filter
16.375x21.5x1 AIRx DUST Air Filter
16.375x21.5x1 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

$24.95

$31.19
Code DF20 · Save 20%
$24.95 per filter
Code DF20 · Save 20%
SAVE 0% 1-pack
In Stock, Ships onWednesday, Sep. 30th
Add $70.00 more to unlock free shipping! Add this and you're just 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
16 ½ × 21 ½ × 1"
Actual Size
16 ½ × 21 ½ × 1"
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

KFAFK0212MED

Carrier

P110143

National Filter Sales

PF-01-16.375x21.5x01-6

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
167 verified reviews
5★
(132)
4★
(28)
3★
(2)
2★
(3)
1★
(2)
5
4.7 / 5 (167)
William C. 276 days ago
4
I change filters once a month, they are very effective collecting dust.
Boston L. 447 days ago
5
The special size fits my unit perfectly.
Walter C. 511 days ago
5
We have been using your filters for ten years. Very happy with product
Ken H. 598 days ago
5
Very good quality.
Barbara L. 616 days ago
5
I have used this company for several years. Product is great and delivery is excellent.
Mary A. 784 days ago
5
Great value. Great product.
Eddie K. 794 days ago
5
Hard to find size. But, they have it! Thanks
Francisco R. 804 days ago
5
The best product
Dennis B. 846 days ago
5
………………………..
Jan W. 961 days ago
5
Works for me. This filter is an odd size & not available easily. Happy to have found this vendor. Shipping is fast.
Charles K. 1055 days ago
5
A high-quality product at a very very good price they always fit perfectly into my furnace.
Eddie K. 1153 days ago
5
Quality filters.
Jennie F. 1214 days ago
5
We’ve used this company before and very satisfied
Michael 1277 days ago
5
Discount Filters provided the correct size filter for my Carrier unit. These filters cannot be purchased at Walmart, Home Depot or Lowe’s because of the dimensions. Discount Filters delivers my order upon request and shipped quickly. Thank you Discount Filters
Elvin S. 1278 days ago
5
I change the filter every two months
Rosa C. 1281 days ago
5
Good quality for good price.
Ronald M. 1442 days ago
5
Fit perfectly and like that Discount Filters let’s us know when to replace the next filter.
Dan 1495 days ago
5
Quality product delivered on time and at a fair price
Louann 1652 days ago
5
The description was spot on and these are better than the ones the manufacturer had left for the unit. I got my order very quickly.
Louann 1796 days ago
5
After looking in every store around we found exactly what we needed here. Ordering was easy & delivery was quick.
Ronald C. 1830 days ago
4
Does a decent job; I need to replace more often than stated guidelines. I don't know if this is normal, as I switched to these last year from permanent washable type, but pleats are not uniformly spread out; some too wide and some scrunched up together.
customer 1855 days ago
5
Perfectly fits my home air conditioner. Can't find these anywhere in the big box stores.
DOUGLAS H. 1856 days ago
5
Quality and convenient
Boston L. 1889 days ago
5
Excellent filters. Nowhere else had these hard to find filters.
Marlene K. 1928 days ago
5
I am very pleased with this product.
John G. 1941 days ago
5
Great service, replacement reminders are a great help in keeping my air handler clean. Filters are an exact fit preventing blow by.
Michael R. 1944 days ago
5
Filters right size. Also good quality.
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