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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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20x20x1 AIRx High Flow Air Filter

5
73 reviews
◆
 
Average rating 4.8/5
5 stars
(64)
4 stars
(6)
3 stars
(1)
2 stars
(1)
1 star
(1)
AIRx 20x20x1-High-FlowOur#: 194851
Made in USA
20x20x1 AIRx High Flow Air Filter
20x20x1 AIRx High Flow Air Filter
20x20x1 AIRx High Flow Air Filter
20x20x1 AIRx High Flow Air Filter
20x20x1 AIRx High Flow Air Filter
20x20x1 AIRx High Flow Air Filter
20x20x1 AIRx High Flow 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

Having trouble with your AC or Furnace shutting down or struggling to keep up with heating or cooling needs? Energy bills costing too much? The New AIRx High Flow filter solves the problem with improved airflow of ordinary pleated filters.
Better airflow means your AC or Furnace doesn't have to work as hard and will heat or cool your home in less time and at a lower energy cost.
With 65% more filter media, High Flow filter greatly improves air flow while reducing potentially harmful pollutants in your air.
Perfect for all HVAC systems, especially older or sensitive systems.
MERV 11 rating means the filter attracts household allergens like dust, pollen, mold spores, dander, smoke and smog.
Did we mention 65% more pleated media?!
Made with pride in the USA.
Fast Shipping and Free Returns.

$27.99

$34.99
Code DF20 · Save 20%
$27.99 per filter
Code DF20 · Save 20%
SAVE 0% 1-pack

Pack Size

In Stock, Ships onMonday, Sep. 28th
$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!

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
0.14" 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
11 28 68 86 Initial Resistance (IWC) 0.09 0.14 0.2 0.28 0.2 *
MERV
11
(µm) PSE (%)
0.3-1.0 28
1.0-3.0 68
3.0-10 86
Airflow Rate (CFM) Initial Resistance (IWC)
410 0.09
615 0.14
819 0.2
1024 0.28
819 * 0.2 *
* Max Rated Airflow

About This Product

Is this the right air filter for you?

Having trouble with your AC or Furnace shutting down or struggling to keep up with heating or cooling needs?  Energy bills costing too much?  The New AIRx High Flow filter solves the problem with improved airflow of ordinary pleated filters.

Better airflow means your AC or Furnace doesn't have to work as hard and will heat or cool your home in less time and at a lower energy cost. 

With 65% more filter media, High Flow filter greatly improves air flow while reducing potentially harmful pollutants in your air.

  • Perfect for all HVAC systems, especially older or sensitive systems.
  • MERV 11 rating means the filter attracts household allergens like dust, pollen, mold spores, dander, smoke and smog.
  • Did we mention 65% more pleated media?!
  • Made with pride in the USA.
  • Fast Shipping and Free Returns.

Customer Reviews

4.8 4.8 out of 5 stars
73 verified reviews
5★
(64)
4★
(6)
3★
(1)
2★
(1)
1★
(1)
5
4.8 / 5 (73)
BC W. 7 days ago
5
Improvement in air flow noted.
LAWRENCE B. 161 days ago
5
My wife and I have allergies. We tried the lower MERV number filters but they did not filter out enough of the finer particles. DF suggested we try the MERV 11 HIGH FLOW filters and we noticed right away that they made a difference. Our AC company agreed with DF and we have been using them ever since. I highly recomend them if you have allergies.
Maria T. 163 days ago
5
I had my entire heating & cooling system replaced last June & thrse filters were recommended. I have been changing them every 3 months and it serms to be doing the job.
Paula V. 169 days ago
5
It’s the only air filter we use. It traps forest fire smoke really well and I will do an early change out when needed.
David G. 181 days ago
5
quality as described, as delivered.
Jerrie B. 192 days ago
5
Awesome product at a very good price
Darrell 235 days ago
5
Very pleased with the high flow filter so far. Wish they offered this type of filter in other sizes. My other unit requires a 20 x 24 x 1 filter and they don’t offer the high flow in that size.
PETKOV 251 days ago
5
have used this filter for years. It does the job!
Michael h. 269 days ago
5
Great cost perfect fit
LAWRENCE B. 410 days ago
5
They work really well for us this is our second order the Merv 11 HIgh Flow filters. We have allergys and since we stared using these filters we have noticed a diffrence in the house. Highly recommend these if you have allergys.
Jean M. 411 days ago
5
Great service fast delivery and quality product
Aaron 460 days ago
5
This product works as well as the original.
pf 471 days ago
5
Great filters, seems like more air is moving and rooms are cooler in summer, catch lots of dust and etc.
PATSY L. 475 days ago
5
Excellent product and good price!!
kathleen m. 479 days ago
5
Excellent product!
PETKOV 541 days ago
5
works as intended
Teresa 598 days ago
5
These are by far the best ac filters we have ever purchased. They do a superior job at filtering the air and they are very well madevv
Marion S. 602 days ago
5
This has been the best product what a difference in my home this had made
Liam G. 648 days ago
5
They work fine and the 4 pk will get me through the winter
Alan L. 731 days ago
5
The quality is much better than the product I can purchase at a box store.
Joseph R. 756 days ago
5
Excellent filter, well made.
Ralphie O. 788 days ago
5
Keeps all ducts clean. No dust balls with these filters Excelent flo.
Richard K. 799 days ago
5
Great product and service.
Pam S. 826 days ago
5
Great product. Feel very good that the air in my home is being filtered well and that the airflow is not being restricted excessively.
Capprice P. 827 days ago
5
Great Product
Conneye K. 841 days ago
5
Thank you!
Conneye K. 889 days ago
5
Does the job & don't have to change too often!
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