Filterbuy 20x20x1 Air Filter MERV 13 Optimal Defense (4-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size:

4.6 4.6 out of 5 stars | 20,861 ratings

Price: 38.7

Last update: 04-10-2025


About this item

20x20x1 replacement air filters for your furnace, air conditioner, heat pump, or HVAC system (actual size: 19.50" x 19.50" x 0.75")
MERV 13 synthetic media (comparable with MPR 1500 - 1900 & FPR 10) protects homes from bacteria and more by trapping 98% of airborne particles without impacting air flow
High quality construction features an electrostatically charged design with 16 pleats per foot that captures more harmful particles and lasts 3x longer than fiberglass models (replace every 90 days for best performance)
Easy installation beverage board frames with dual wire backings improve structural integrity and outperform standard cardboard designs by resisting extreme temperatures
Industrial grade components are 100% manufactured in the United States and designed with recyclable materials

Product information

Technical Details


Top reviews from the United States

  • mjkilb
    5.0 out of 5 stars Good quality, good value
    Reviewed in the United States on December 6, 2022
    The community I live in supplies a filter every month. The filters are the worst quality. They only last a few weeks, and do not catch all the small particles. I have a dog that does not shed much, but still there is dander in the air. I also live on a heavy traffic road with many trucks and surrounded by farms. Our windows are of low quality and do not seal well. You can imagine the dust we get.

    Keeping all those factors in mind, I need a high quality filter. I went with the MERV 13 for its ability to filter small particles and last longer. I get 6 to 8 weeks use out of a filter. Not as long as advertised, but that is likely due to the conditions it has to filter. I purchase the muli-pack for economics. I will try to provide photos of the filters when I change them next.

    I will continue to purchase these filters, even if the cost increases.
  • HJ
    5.0 out of 5 stars Best Merv13 filters for C-R boxes
    Reviewed in the United States on October 23, 2024
    I build a Corsi-rothenthal box air purifiers with filters like this, these are some of the best quality merv 13 filters I have used. highly recommended.
  • Rose S.
    5.0 out of 5 stars good price. made in usa
    Reviewed in the United States on February 2, 2025
    fit like a glove, buy in bulk its cheaper
  • Seven
    4.0 out of 5 stars Clean Air
    Reviewed in the United States on April 22, 2020
    So i have switched from Merv 11 filters, because lately i have been having allergies which i have never had before. I have been having a problem with humidity in my apartment and the air handler has mildew. So while i am waiting on a dehumidifier, i have installed these filters and have noticed that my stuffiness has gotten better within the two days i put the filters in. Merv 13 filters are supposed to be able to catch mold, so if that is the case it is doing its job. I have not noticed any difference in AC operation, my Ac is not having a problem pulling air through this compared to the Merv 11. I also smoke bud in the house, and i notice that it completely eliminates the smell which is quite surprising, it's not something that i would expect from a filter that doesn't have say .. "charcoal".

    The only reason i gave this filter a 4 and not a 5 is because the filter corners came in damaged, even though the shipping box had no damage at all, which makes me think they packaged the product with damage and still shipped it.. fortunately it doesn't affect the operation of the filters. Also to people who say this is the wrong size, they need to understand that ALL filters run smaller then they are intended to be. These were 19.5 inches which is just fine, i've had no issue and will be buying these again.

    p.s. can't beat the price for merv 13.
  • Emma Jane
    5.0 out of 5 stars Works very well
    Reviewed in the United States on November 20, 2024
    Noticeable difference in dust and air quality after switching to these! I have them on my subscription list for auto delivery now
  • Matt Seegers
    5.0 out of 5 stars Exactly what we needed and at a very good price
    Reviewed in the United States on September 7, 2020
    My wife and I struggled for months to source the proper HVAC air filter for our system. A large part of the issue may have been due to the fact that the HVAC hardware in the attic is clearly a Frankenstein situation where previous owners had HVAC techs "rebuild" the whole indoor evaporator mechanism with a bunch of random parts from at least 3-5 different brand names.

    Anyways, I was tasked with managing this part of the condo once I moved in a few years ago and it was a struggle to figure out how it should be properly set up. After buying several filters of the wrong format/size we finally were able to confirm with an HVAC tech the proper size and proper installation of said filter.

    These filters are great. The only thing you should be concerned about is how well your HVAC system can handle higher-grade filters. I knew I wanted a HEPA-graded filter (I did my best to vacuum/clean out the ducts at least 2-3 times in the past 5 years), but I didn't realize that it could impact the performance of the HVAC system if it's too high of a grade. The filter an HVAC tech installed when we were trying to figure out why the system wasn't working consistently was almost transparent and clearly did not impede airflow.

    These filters need to be installed in the right direction (common with any decent filter) and clearly require much more force to push air through them than any super cheap option your HVAC tech might have in their truck. Does having a HEPA-grade filter impact airflow from the vents? Yes. Is it worth it? Yes--assuming your system can handle pushing air through the new bottleneck.

    Unfortunately, if your HVAC system can't handle moving air through this I think you will be in the market for a new evaporator/internal HVAC component in the near future. I spent hours (in aggregate) researching options for this and coming up with possible fixes that wouldn't require replacing the whole AC unit. We ultimately had to due to the compressor (the part that's outside) failing, but the installers confirmed that the old unit wouldn't have been able to keep up with higher-end filters anyways.

    TL;DR: Great filters. Only problem is that if your HVAC isn't robust enough to support pushing air through high-grade filters it will prove to you and your family that you need a new system. I still highly recommend these filters but if you're switching from super cheap/no-name filters to this and your system is old... you may be looking at a whole new HVAC setup if it can't handle airflow effectively.
  • Bobby McPhail
    5.0 out of 5 stars Great
    Reviewed in the United States on January 19, 2025
    Used to make a room filter with a 20” box fan!
  • LUIGI
    5.0 out of 5 stars Perfect for my house.
    Reviewed in the United States on November 19, 2024
    They fit perfectly and the house's air feel way better..I recommend it????????

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