20x24x1 Air Filters – FAQ & Buyer’s Guide!

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man changing 20x24x1 air filter

Are you having trouble choosing an air filter that is right for your air system? The good news is that you are not alone in this and we are here to give you some tips on how to go about this the right way. But before we get into that, let us cover some of the most popular options on the market and their features:

List of Top-Rated 20X24X1 Air Filters

Filtrete 20x24x1 Ultimate AllergenFiltrete 20x24x1 Ultimate Allergen
  • MERV rating - 1300
  • Certified asthma & allergy friendly
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Nordic Pure 20x24x1 PleatedNordic Pure 20x24x1 Pleated
  • MERV Rating - 13
  • Made in the USA
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E-Z Flow 20 x 24 x 1-InchE-Z Flow 20 x 24 x 1-Inch
  • MERV Rating - 4
  • Maintains efficiency up to 30 days
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Aerostar 20x24x1 PleatedAerostar 20x24x1 Pleated
  • MERV Rating - 13
  • Manufacturer - USA filtration group
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Flanders PrecisionAire PleatedFlanders PrecisionAire Pleated
  • MERV Rating - 8
  • Maintains efficiency up to 90 days
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Table of Contents

The Best 20X24X1 Air Filters Reviews

Filtrete UT26-2PK-6E

This furnace filter 20x24x1 is also available in frustration-free packaging, and if you want to save yourself the time taken to open up the package, it is an ideal option. It works for HVAC systems, air conditioning, and furnaces and is suitable for various models, provided that you refer to your manual.

With 3-in-1 technology in play, the filter can remove pollutants in the air, ensuring that the air running through the vents and into the individual rooms is clean. Amongst the contaminants, it can eliminate include bacteria, viruses, lint, smoke, dust, and other allergens which can trigger asthma attacks.

The MERV rating of the filter is 13, which is equivalent to a micro-particle performance rating of 1900. It is thus suitable for people with severe allergies as it can remove 90% of the unwanted particles in the air, including those of micron size. It comes in several sizes, and you can thus choose what best fits your space according to the manual.

Under standard use, this filter will last three months before it is time for a change. It comes with a filter change reminder program, which works great for people who are prone to forgetting such timings.

Though it is mainly suited for residential use, you can also use it in commercial spaces where the filtration needs are not off the charts.

Product Features

  • Works for HVAC systems, air conditioning, and furnaces
  • MPR rating of 1900
  • MERV 13 rating
  • Lasts 90 days
  • Suited for residential use
  • 3-in-1 technology
  • Filter change reminder program


  • Long lasting
  • Has change alerts
  • Works for people with severe allergies
  • High pollutant capture rate
  • Easy installation process
  • Gives you value for your money


  • Strains the HVAC system

Nordic Pure 20x24x1M12-6

It is essential for you to differentiate between nominal and actual dimensions, lest you end up buying something unsuitable for your home. With this 20x24x1 air filter, you will get measurements of 19.5*23.5*0.75, which falls short of the nominal size.

However, where you have an air system with these requirements, the filter will work great. This filter features a MERV rating of 12, which is equivalent to an MPR rating of 1500-1923 and it thus works in homes with high filtration needs with ease.

It can capture most particles from pollen to mold spores to household fibers, keeping them from the vents and thus saving you lots of money on repairs.

The filter uses electrostatic charges to attract and capture particles, and it features pleats that increase its dust-holding capacity, and it can thus last ninety days before a replacement is due. The filter and its components are 100% made in the USA, and you should thus enjoy a sturdy construction.

Product Features

  • The actual size is 19.5*23.5*0.75
  • MPR rating of 1500-1923
  • MERV 12 rating
  • Pleated
  • Electrostatic
  • Made in the USA


  • High quality
  • Antimicrobial
  • Hypoallergenic
  • Gives you value for your money
  • Long-lasting
  • Simple installation process


  • Slight airflow restriction

E-Z Flow Air Filter

This air conditioner filter 20x24x1 is available in a twelve-pack which should last you through a year, under standard use. It works to protect your HVAC system through the prevention of entry of unwanted particles which can clog the moving parts and lead to a mechanical breakdown. With a MERV 4 rating, this filter can get rid of large particles such as dust, lint, and pollen. Note that though it may catch particles that are smaller than this, its main objective is to protect the air system from large particles and will thus be less effective in eliminating viruses and bacteria. For someone without allergies, pets, and other reasons for filtration concerns, this filter will do.

Its frame is quite sturdy, and it features continuous chipboard for added strength, allowing it to be suitable for various climates. It works with many HVAC systems as it does not strain them and thus does not void warranties or raise utility costs. You can expect service from this filter for thirty days or so, and you can change it more often if you deem it necessary to do so.

Product Features

  • Pack of twelve
  • MERV 4 rating
  • Chipboard frame
  • Metal media retainer
  • Lasts 30 days


  • Sturdy build
  • Value for your money
  • Works in various climates
  • Protects the HVAC system
  • Unrestricted airflow
  • Easy to install


  • Requires frequent changing

Aerostar 20x24x1 MERV 13

This ac filter 20x24x1 comes in a MERV 13 rating which works great for people with severe allergies as well as those who live in highly polluted environments or areas with limited ventilation. The actual dimensions of this filter are 19.5*23.5*0.75, and its rating is comparable to an MPR rating of 1500-1900. You can count on it to eliminate large particles such as pollen and dust mites as well as the tiny contaminants such as pet dander and bacteria. The pleats in its build add to its surface area and allow it to capture more unwanted particles than filters without such a feature. It also helps that the filter is resistant to moisture and will thus not encourage microbial growth, which can threaten your health and that of your loved ones.

It works for both AC systems and furnaces and lasts ninety days under standard use. During hot and cold months, you may have to make the replacements more often as your system works harder during such months.

Product Features

  • MERV 13 rating
  • Pleated
  • The actual size is 19.5*23.5*0.75
  • MPR rating of 1500-1900
  • 90% capture rate
  • Works for three months

Pros and Cons


  • Long lasting
  • Good for people with allergies
  • Value for your money
  • Strong construction
  • Fast to install
  • Resistant to moisture


  • Restricted airflow

Flanders 84858.012024

Did you know that it’s not your cat’s fur that provokes an allergic reaction but its dander? If you have any problems with that or with creating a cleaner and fresher indoor environment in general, NaturalAire Standard Air Filter can help. This product reduces up to 75 % of large airborne particles and captures most of the unwanted pollution fragments in your home that include pet dander, mold spores, virus carriers, bacteria, lint, and dust (dust mites), etc.

Easy to install and remove, its robust construction has a clay-coated frame and is moisture resistant. NaturalAire filter has a Merv (Minimum Efficiency Reporting Value) 8 rating which means GOOD for trapping dust particles (3–10 microns in size). This filter will have no problems with catching all the average-sized air pollutants around your place.

NaturalAire filter uses a mechanical filtration to maintain the minimum listed efficiency through its 90 days of service. A reliable household assistant is available in a variety of sizes to fit most household air cooling/heating systems and is also UL (Underwriters Laboratories) classified (safety testing), which makes it a reliable product that provides suitable air for most home air filtration systems.

Product Features

  • Varying packaging options
  • This is a pack of 12
  • Dimensions – 20” x 20” x 1”
  • Item Weight – 0.61 lbs
  • MERV rating of 8
  • Lasts ninety days

How to pick a 20x24x1 air filter

The Size

The size of the filter is essential, and you should get one that is in line with the furnace-manual dimensions or one that measures what your current filter does. Ensure that you pay note to the actual aspects as the nominal figures can confuse you and make you buy something that will not serve your system. Anything too big will bend and reduce efficiency, and anything smaller than is necessary will allow particles through to the vents. If you get a filter model that is similar to that of your air system, the chances are high that you will get the right fit. However, you can consider aftermarket options that work just as well and are available at reasonable prices.

Air Quality

Where your indoor air quality is low, it will serve you well to get a filter with a high rating as it will improve the air. Scenarios that call for highly efficient filters include homes where there are pets, smokers, lots of insulation, poor ventilation, polluted outdoors, and other circumstances which may adversely affect the quality of air. Take an example of a home with tight insulation. Though this works great for those cold months where you need every bit of warmth that you can get, it also works against you in that pollutants accumulate with ease indoors. The same goes for homes with poor ventilation as contaminants tend to remain in the house. As the pollutants increase, the strain on your air system also increases, and you will end up paying a lot. Where you live in a large city or near fields, you are likely to deal with pollution in your home, and the higher the MERV rating that you get, the better for you and your loved ones. People with allergies should also consider ratings that are suitable for their needs.

You should also consider the various types of filters, their lifespans, and which one is suitable for your needs before reaching a decision.

Importance of Air Filters

You may wonder why there is so much fuss as to the need for a good filter and if it is worth the money you have to invest in it. It is easier to understand the importance of a filter when you look at the situation from the perspective of your system’s efficiency. Your air system draws air from your surroundings and circulates it through the various rooms, and in doing this, it is likely to pull in particles from the air. These particles, having built up in the delicate components of your HVAC system, lead to clogging, and it is only a matter of time before you have to call in an expert to repair your system.

Additionally, the buildup makes your system work harder than it should, and you end up spending a lot of money in utility costs. As a bonus, air filters also get rid of allergens in the air, and you thus get to hit two birds with one stone. Hopefully, these benefits will eliminate any hesitation that you may have towards such an investment as this will help you enjoy cleaner air for better health. Make that purchase today!

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