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The 8 Best 18x 24 x 1 air filters of 2024

Are you trying to find 18x 24 x 1 air filters among various brands on the market but aren’t sure where to begin? To assist you in finding the right one, we’ve put together a list of the 7 best to help you pick the perfect one!

We investigated and evaluated a number of the top-selling 18x 24 x 1 air filters on the market in order to create our list of the best. Making a decision among the many options available is never simple. There are an infinite number of models available, each with a distinct price. And as you’ll find out, the best options aren’t usually the ones you imagine! This comparison is rich and relevant because of the numerous factors that were employed. You will find products featured in this ranking not only based on their pricing but also on their features and other customers reviews. To write this review, we completed 20 hours of research and did 48 18x 24 x 1 air filters tests. You won’t need to pick products at random any more. If you’re unsure of what to look for, browse our list and consult the buying guide!

An overview of our top picks

Table of contents

The best 18x 24 x 1 air filters you can buy today

No. 1
Filtrete 18x24x1 AC Furnace Air Filter, MERV 5, MPR 300, Capture Unwanted Particles, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 6-Pack (Actual Size17.81x23.81x0.81 in)
  • MAKE YOUR HOME YOUR SANCTUARY: 6-pack of 3-month pleated Filtrete 18x24x1 MPR 300 AC Furnace Air Filter helps capture unwanted particles from your household air to contribute to a cleaner, fresher home environment
  • DIFFERENT FROM NOMINAL SIZE: Slightly different from the nominal size, this air filter’s exact dimensions are 17.81 x 23.81 x 0.81
  • EXCLUSIVE TECHNOLOGY: Designed with exclusive Filtrete 3-in-1 technology to pull in and trap unwanted particles, allowing cleaner air to flow through
  • COUNTLESS PARTICLES: With a 300 MPR and MERV 5 rating, your Filtrete Filter will help capture many particles from the air passing through it
  • VERSATILE USES: Works for changing the air filters in your furnace, air conditioner/heating system or HVAC system
  • CHANGE YOUR FILTER OFTEN: For optimal performance, make sure to change your filter at least once every 90 days
  • SUBSCRIBE AND SAVE: On your first order, simply click on Subscribe and Save" to set up your delivery schedule and save up to 10% on your orders
No. 2
Filtrete 18x24x1 Air Filter, MPR 1000, MERV 11, Micro Allergen Defense 3-Month Pleated 1-Inch Air Filters, 2 Filters
  • MAKE YOUR HOME YOUR SANCTUARY: 2-pack of 3-month pleated 1” Filtrete 18x24x1 MPR 1000 AC Furnace Air Filter helps capture unwanted particles from your household air to contribute to a cleaner, fresher home environment
  • DIFFERENT FROM NOMINAL SIZE: Slightly different from the nominal size, this air filter’s exact dimensions are 17.81 x 23.81 x 0.81
  • EXCLUSIVE TECHNOLOGY: Designed with exclusive Filtrete 3-in-1 technology to pull in and trap unwanted particles, allowing cleaner air to flow through
  • COUNTLESS PARTICLES: With a 1000 MPR and MERV 11 rating, your air filter will help capture many microparticles from the air passing through it
  • VERSATILE USES: Works for changing the air filters in your furnace, air conditioner/heating system or HVAC system
  • CHANGE YOUR FILTER OFTEN: For optimal performance, make sure to change your filter at least once every 90 days
  • SUBSCRIBE AND SAVE: On your first order, simply click on Subscribe and Save" to set up your delivery schedule and save up to 10% on your orders
No. 3
BNX TruFilter 18x24x1 Air Filter MERV 8 (6-Pack) - MADE IN USA – Dust & Pet Defense Electrostatic Pleated Air Conditioner HVAC AC Furnace Filters for Dust, Pet, Mold, Pollen MPR 600 – 700 & FPR 5
  • 16x25x1 MERV 8 air filter replacement for your air conditioner, furnace or HVAC system. Actual Size: 17 11/16’’ x 23 11/16’’ x 3/4‘’. Comparable with MPR 600 & FPR 5.
  • MADE IN USA, SUSTAINABLY - Proudly manufactured by BNX Converting, LLC in Houston, TX, a registered and approved facility (EPA Registration # 101638-TX-1). Adopts single sided (one-piece) frame technology to reduce environmental waste and made sustainably from recycled cardboard.
  • SUPERIOR PERFORMANCE - The BNX MERV 8 100% synthetic air filter media outperforms standard fiberglass filters and adopts the latest in electrostatic filtration technology to allow for industry leading superior low air flow resistance while maintaining the highest grade level of filtration.
  • CAPTURES MICROSCOPIC PARTICLES - The BNX air filter has a MERV 8 rating allowing it to capture 85% of microscopic airborne particles without impacting air flow. Captures microscopic particles such as odors, pet dander, allergens, dust, lint, mold, dust mites. Noticeably cleaner air in 48 hours.
  • BNX Quality Promise & Applications - BNX is committed to delivering the highest quality American made safety products, made with American workers, and using the latest automated manufacturing processes and technology with the strictest quality standards.
No. 4
BNX TruFilter 18x24x1 Air Filter MERV 11 (6-Pack) - MADE IN USA - Allergen Defense Electrostatic Pleated Air Conditioner HVAC AC Furnace Filters for Allergies, Dust, Pet, Smoke, Allergy MPR 1200 FPR 7
  • 18x24x1 MERV 11 air filter replacement for your air conditioner, furnace or HVAC system. Actual Size: 17 11/16’’ x 23 11/16’’ x 3/4‘’. Comparable with MPR 1000 -1200 & FPR 7. Electrostatically charged filter media with industry leading low air flow resistance.
  • MADE IN USA, SUSTAINABLY - Proudly manufactured by BNX Converting, LLC in Houston, TX, a registered and approved facility (EPA Registration # 101638-TX-1). Adopts single sided (one-piece) frame technology to reduce environmental waste and made sustainably from recycled cardboard.
  • SUPERIOR PERFORMANCE - The BNX MERV 11 100% synthetic electrostatically charged air filter media outperforms standard fiberglass filters and adopts the latest in electrostatic filtration technology to allow for industry leading superior low air flow resistance while maintaining the highest grade level of filtration.
  • CAPTURES MICROSCOPIC PARTICLES - The BNX air filter has a MERV 11 rating allowing it to capture microscopic airborne particles without impacting air flow. Captures microscopic particles such as odors, pet dander, allergens, dust, lint, mold, dust mites. Noticeably cleaner air in 48 hours.
  • BNX Quality Promise & Applications - BNX is committed to delivering the highest quality American made safety products, made with American workers, and using the latest automated manufacturing processes and technology with the strictest quality standards.
No. 5
Filterbuy 18x24x1 Air Filter MERV 8 Dust Defense (4-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 17.38 x 23.38 x 0.75 Inches)
  • 18x24x1 replacement air filters for your furnace, air conditioner, heat pump, or HVAC system (actual size: 17.38" x 23.38" x 0.75")
  • MERV 8 synthetic media (comparable with MPR 600 & FPR 5) protects homes from dust, pollen, and more by trapping 90% of airborne particles without impacting air flow
  • High-quality construction features an electrostatically charged, pleated design that captures more harmful particles and prolongs the products lifespan by 3 times that of fiberglass models
  • Industrial-grade beverage board frames with dual wire backings outperform standard cardboard designs
  • All components are manufactured within the United States and designed with recyclable materials
No. 6
BNX TruFilter 18x24x1 Air Filter MERV 13 (6-Pack) - MADE IN USA - Electrostatic Pleated Air Conditioner HVAC AC Furnace Filters for Allergies, Pollen, Mold, Bacteria, Smoke, Allergen, MPR 1900 FPR 10
  • 18x24x1 MERV 13 air filter replacement for your air conditioner, furnace or HVAC system. Actual Size: 17 11/16’’ x 23 11/16’’ x 3/4‘’. Comparable with MPR 1500-1900 & FPR 10. Provides optimal defense with electrostatically charged filter media and industry leading low air flow resistance.
  • MADE IN USA, SUSTAINABLY - Proudly manufactured by BNX Converting, LLC in Houston, TX, a registered and approved facility (EPA Registration # 101638-TX-1). Adopts single sided (one-piece) frame technology to reduce environmental waste and made sustainably from recycled cardboard.
  • SUPERIOR PERFORMANCE - The BNX MERV 13 air filter media outperforms standard fiberglass filters and adopts the latest in electrostatic filtration technology to capture maximum pollen, mold bacteria, smoke, carriers & other microscopic particles while maintaining industry leading superior low air flow resistance.
  • CAPTURES MICROSCOPIC PARTICLES - The BNX air filter has a MERV 13 rating allowing it to capture 98% of airborne particles without impacting air flow. Captures microscopic particles such as virus-carriers, bacteria, odors, smoke, and pollen, pet dander, allergens, dust, lint, mold, dust mites, smog.
  • BNX Quality Promise & Applications - BNX is committed to delivering the highest quality American made safety products, made with American workers, and using the latest automated manufacturing processes and technology with the strictest quality standards.
No. 7
True Blue Allergen 18x24x1 Air Filter , MERV 11, 4-Pack
199 Consomer Reviews
True Blue Allergen 18x24x1 Air Filter , MERV 11, 4-Pack
  • 18 x 24 x 1 Pleated air filter
  • Filters sub-micron airborne allergens like dust, dirt, pollen, pet dander, dust mite debris, microscopic allergens, smoke and smog
  • Performance allergen reduction filter
  • Lasts up to 120 days
  • Minimum efficiency reporting value or MERV rating is 11
SaleNo. 8
Filtrete 18x18x1 Air Filter, MPR 300, MERV 5, Clean Living Basic Dust 3-Month Pleated 1-Inch Air Filters, 6 Filters, White
  • MAKE YOUR HOME YOUR SANCTUARY: 6-pack of 3-month pleated Filtrete 18x18x1 MPR 300 AC Furnace Air Filter helps capture unwanted particles from your household air to contribute to a cleaner, fresher home environment
  • DIFFERENT FROM NOMINAL SIZE: Slightly different from the nominal size, this air filter’s exact dimensions are 17.81 x 17.81 x 0.81
  • EXCLUSIVE TECHNOLOGY: Designed with exclusive Filtrete 3-in-1 technology to pull in and trap unwanted particles, allowing cleaner air to flow through
  • COUNTLESS PARTICLES: With a 300 MPR and MERV 5 rating, your Filtrete Filter will help capture many particles from the air passing through it
  • VERSATILE USES: Works for changing the air filters in your furnace, air conditioner/heating system or HVAC system
  • CHANGE YOUR FILTER OFTEN: For optimal performance, make sure to change your filter at least once every 90 days
  • SUBSCRIBE AND SAVE: On your first order, simply click on Subscribe and Save" to set up your delivery schedule and save up to 10% on your orders
No. 9
Accumulair Gold 18x24x1 (17.75x23.75) MERV 8 Air Filter/Furnace Filter (2 Pack)
  • 18x24x1 (17.75x23.75) MERV 8 – Tested and rated according to ASHRAE Standard 52.2
  • Captures up to 76% of common airborne particles such as dust, lint, dust mite debris, cement dust, standing dust, small fibers, and other airborne contaminants
  • Enhances indoor air quality for up to 3 months
  • Pleated electrostatic media provides a high filtration efficiency without comprising your system's airflow
  • Typically ideal for residential homes, small commercial businesses, and workplaces desiring to reduce common airborne containments
SaleNo. 10
Nordic Pure 18x24x1 MERV 12 Pleated AC Furnace Air Filters 6 Pack
  • Nominal Size: 18 x 24 x 1, Actual Size: 17 1/2 x 23 1/2 x 3/4 (17.5 x 23.5 x 0.75)
  • Measure your air filter for the exact size and compare it to our actual size to ensure proper fit.
  • Ideal for high efficiency air filtration and will help those with moderate allergies and asthma.
  • Nordic Pure MERV 12 is equivalent to MPR 1500-1900
  • Made in the USA
SaleNo. 11
18x24x1, Percisionaire Ez Flow Ii Front Panel Merv 4, 10055.011824, Pack12
144 Consomer Reviews
SaleNo. 12
Aerostar 18x24x1 MERV 8 Pleated Air Filter, AC Furnace Air Filter, 6 Pack (Actual Size: 17 3/8' x 23 3/8' x 3/4')
128 Consomer Reviews
Aerostar 18x24x1 MERV 8 Pleated Air Filter, AC Furnace Air Filter, 6 Pack (Actual Size: 17 3/8" x 23 3/8" x 3/4")
  • Nominal Size: 18x24x1; Actual Size: 17 3/8" x 23 3/8" x 3/4"
  • Comparable to MPR 600 Clean Living and Honeywell Micro Defense Plus FPR 5
  • Designed to filter microscopic particles such as lint, dust mites, spores, and pollen.
  • Simple to install and a cost-effective step towards a healthier home environment. For best results, change your filters every 60 to 90 days but increase frequency to 30 days during peak summer and winter months
  • 100% synthetic electrostatic media for high efficiency with low air flow resistance
No. 13
Venti Tech 18x24x1 Washable Electrostatic Air Filter. Reusable HVAC & Furnace Air Filter
2,168 Consomer Reviews
Venti Tech 18x24x1 Washable Electrostatic Air Filter. Reusable HVAC & Furnace Air Filter
  • NO MORE DISPOSABLE FILTERS – Reusable air filter that can be washed as needed
  • SAVE MONEY IN THE LONG RUN – Stop wasting money on disposable filters and invest in a reusable, washable filter that will last a lifetime; Its better air circulation will lower energy costs too!
  • EXTEND THE LIFESPAN OF YOUR HVAC SYSTEM – Improve air flow and automatically reduce stress on the equipment
  • PREMIUM AIR QUALITY – Remove dirt, dust, and other particles
No. 14
Filterbuy 18x24x1 Air Filter MERV 11 Allergen Defense (4-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 17.38 x 23.38 x 0.75 Inches)
  • 18x24x1 replacement air filters for your furnace, air conditioner, heat pump, or HVAC system (actual size: 17.38" x 23.38" x 0.75")
  • MERV 11 synthetic media (comparable with MPR 1000 - 1200 & FPR 7) protects homes from pets, allergies, and more by trapping 95% of airborne particles without impacting air flow
  • High-quality construction features an electrostatically charged, pleated design that captures more harmful particles and prolongs the products lifespan by 3 times that of fiberglass models
  • Industrial-grade beverage board frames with dual wire backings outperform standard cardboard designs
  • All components are manufactured within the United States and designed with recyclable materials
No. 15
Handua 18x24x1 Air Filter MERV 8 Dust Control, Plated Furnace AC Air Replacement Filter, 4 Pack (Actual Size: 17.75" x 23.75" x 0.75")
  • 18x24x1 MERV 8 air replacement filter for your HVAC, air conditioner or furnace system. Handua air filters can be place into your return air filter grille. Actual size: 17.75" x 23.75" x 0.75" Handua MERV 8 filters are comparable with MPR 600 and FPR 5
  • Breathe easy with Handua MERV 8 air filters. These filters offer top-tier performance and are engineered to capture a wide range of allergens, including, dust, pet hair, and smoke. With Handua MERV 8 filters, you don't have to worry about the purity of your home air.
  • Handua MERV 8 air conditioner filters offer top-tier performance due to their thicker build and pleat-heavy design, surpassing most retail air filters in airflow, efficiency, and capture coverage. Our filters provide consistent and high performance filtration for up to three months.
  • Handua MERV 8 air filters are easy and simple to use. All you have to do is slide the filter into the air filter return of your AC unit, ari vents/grilles or furnace, and you can breathe easy knowing your air is secure. We recommend changing your filters every 90 days to maintain air quality, or more frequently for houses with specific air requirement needs.
  • Manufactured by a company specialized in air purification equipment, these filters are made with high-quality materials and advanced technology, ensuring they provide the best possible air filtration for your home.
No. 16
wioAIR Washable Air Filter(18" x 24" x 1"), Aluminum Electrostatic Air Filter for Furnace and Central Air Conditioner
  • wioAIR aluminum washable air filters are designed to be washed and reused, making them a cost-effective and environmentally friendly option.
  • The combination of three layers of heavy-duty aluminum and two layers of high-density static electricity nylon enables the filter to effectively capture lint, dust, pet dander, and more.
  • Metal filters typically have lower air resistance than disposable filters, resulting in reduced pressure on your HVAC system.
  • We recommend washing the filter every three months to ensure filtration performance and maintain its effectiveness.
No. 17
Flanders E-Z Flow II - 18'' x 24'' x 1'' - Disposable Filters - MERV 4 - Qty. 12
  • Flanders E-Z Flow II - 18'' x 24'' x 1'' - Disposable Filters - MERV 4 - Qty. 12
SaleNo. 18
Filtrete 18x24x1 Air Filter, MPR 1900, MERV 13, Healthy Living Ultimate Allergen 3-Month Pleated 1-Inch Air Filters, 2 Filters
  • The higher the MPR, the more microparticles--such as pollen, pet dander, smoke, bacteria and viruses--your filter will capture from the air passing through it
  • FOR OPTIMAL PERFORMANCE of your heating & cooling system or HVAC system, change your home air filter at least every 90 days for 1 in. filters
  • A dirty filter will slow down air flow and make the system work harder to keep you warm or cool--wasting energy. Sign-up for a filter change reminder program that works for you!
  • OUTPERFORMS FIBERGLASS, WASHABLE AND NON-ELECTROSTATIC 3-month pleated 1 in. home air filters for your furnace, air conditioner or HVAC system
  • DESIGNED WITH EXCLUSIVE Filtrete Brand 3-in-1 technology from 3M to trap unwanted air particles while letting cleaner air flow through
  • ATTRACTS AND CAPTURES microscopic particles such as smoke, cough and sneeze debris, bacteria and viruses--and large particles, including lint, household dust and pollen
  • 62% SMALL PARTICLE CAPTURE, like bacteria and particles that carry viruses ( % captured is based on ASHRAE 52.2 testing for 0.3 to 1 micron particles from the air passing through the filter, which relates to HVAC industry standard efficiency testing)
  • CERTIFIED as asthma & allergy friendly (As outlined in report ASCR: 1197-01)
  • MPR 1900 has a rating of MERV 13
  • CREATE A CHANGE COUNTDOWN in the Filtrete Smart App. Simply use the app to scan the barcode on your filter’s packaging, then choose 30, 60 or 90 days for your replacement countdown. When the lifespan is up, you’ll get a notification to change your filter
No. 19
Filtrete 18x24x1 Air Filter MPR 1200 MERV 11, Allergen Defense Odor Reduction, 4-Pack (exact dimensions 17.81x23.81x0.81)
  • 25 times more effective in odor removal than other national retail home air filters, based on a comparison of organic vapor capacity
  • ACTIVE CARBON LAYER acts as odor eliminator for pet smells, smoke, cooking, mildew and cleaning chemicals
  • OUTPERFORMS FIBERGLASS, WASHABLE AND NON-ELECTROSTATIC 3-month pleated 1 in. home air filters for your furnace, air conditioner or HVAC system
  • DESIGNED WITH EXCLUSIVE Filtrete Brand 3-in-1 technology from 3M to trap unwanted air particles while letting cleaner air flow through
  • ATTRACTS AND CAPTURES particles such as lint, pollen, dust, pet dander, smoke and smog
  • 1200 Odor MPR has a rating of MERV 11
  • The higher the MPR, the more microparticles--such as pollen, pet dander, smoke, bacteria and viruses--your filter will capture from the air passing through it
  • FOR OPTIMAL PERFORMANCE of your heating & cooling system or HVAC system, change your home air filter at least every 90 days for 1in. filters, and at least every 12 months for 4 in. and 5 in. filters
  • A dirty filter will slow down air flow and make the system work harder to keep you warm or cool--wasting energy. Sign-up for a filter change reminder program that works for you!
  • FOR RESIDENTIAL use only
No. 20
Filterbuy 18x24x1 Air Filter MERV 13 Optimal Defense (2-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 17.38 x 23.38 x 0.75 Inches)
  • 18x24x1 replacement air filters for your furnace, air conditioner, heat pump, or HVAC system (actual size: 17.38" x 23.38" 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, pleated design that captures more harmful particles and prolongs the products lifespan by 3 times that of fiberglass models
  • Industrial-grade beverage board frames with dual wire backings outperform standard cardboard designs
  • All components are manufactured within the United States and designed with recyclable materials

How to choose a good 18x 24 x 1 air filters

Does the idea of finding a fantastic 18x 24 x 1 air filters make you anxious? When it comes to purchasing this product, specifically when deciding which model to select, has your head been spinning between options? You are not alone if that is the case. We are aware of the pressure involved in the purchasing process!

Your presence here indicates that you are interested in 18x 24 x 1 air filters. Before choosing which product would be the best for your needs after being inundated with information, locate a reliable source with genuine selections. You can get that information from a variety of sources, including buying guides and rating websites, word-of-mouth recommendations from friends and family, online discussion forums where users can share their own experiences, product reviews that can be found all over the internet, and YouTube channels. You can only get the right product through exhaustive analysis. But you realize that’s not always simple. In order to ease your concerns, we have taken the time to develop a list of the top 18x 24 x 1 air filters products available right now. You might be wondering how we came up with the list. How was this buying guide developed?

First, we used our algorithms to gather as much reliable data as we could about these products. To verify all the data gathered, we used both artificial intelligence and a lot of algorithms.
Then, our experts used criteria that are recognized in the business to evaluate them according to their quality to price ratio, allowing us to choose the top 18x 24 x 1 air filters on the market right now!

The selection of the goods is not arbitrary. Before creating a list, we take into account a number of factors. Below are some of the criteria discussed:

Brand Value: What happens if you choose a dubious brand just because it appears to be a good deal? So the likelihood of receiving a product with a short shelf life increases. That is due to the fact that well-known brands have a reputation to uphold, while others do not. Top 18x 24 x 1 air filters brands strive to provide some distinctive traits that set them apart from the competition. So, hopefully one or more of the items on our list will be perfect for you.

Features: Useful features are all you need, not tons of them. We consider the important aspects and select the top 18x 24 x 1 air filters based on those.

Specifications: Numbers always help you measure the quality of a product in a quantitative way. We try to find products with higher specifications, but with the right balance.

Quality: A product’s quality may always be quantified with the aid of numbers. We look for goods with better standards that strike the proper balance. The best quality product that gets highly appreciated and recommended by experienced users.

Customer ratings:  Would it be accurate to suggest that the 18x 24 x 1 air filters were used by hundreds of customers before you? Superior ratings indicate that many customers had better service.

Customer Reviews: Like ratings,  provide you with accurate and reliable information about the product from genuine customers. Customer ratings are very important to all of us because they contain accurate and reliable information about the customer service we received from several hundred customers.

Seller Rank: This is very intriguing! Not only do you need a good 18x 24 x 1 air filters, you also need a product with rising sales that is trendy. It accomplishes two goals. First, the expanding user base proves the quality of the product. Second, given that number, producers must be able to offer greater quality and after-sales support.

Value: You get what you pay for, they say, so consider the value. Cheap isn’t always good and expensive isn’t always bad. However, that does not imply that spending a lot of money on a product that is flashy but underwhelming is a good idea. Before adding them to the list, we make an effort to evaluate how much value you can get for your money from your 18x 24 x 1 air filters.

Durability: Durability and reliability are closely related concepts. You will benefit from a strong and long-lasting 18x 24 x 1 air filters for months and years to come.

Product availability: Products come and go, and new ones replace the old ones. Most likely, a few new features and required changes were made. What use is it to use a supposedly good product if the maker no longer supports it? We make an effort to highlight products that are current and offered by one or more trustworthy sellers, if not more.

Negative Reviews: Yes, we do take that into account as well! The goods with the majority of bad reviews are filtered out and disregarded when we choose the best-rated one on the market.

These are the standards by which we selected our 18x 24 x 1 air filters. Do we end our process there? Hell no. The most crucial fact about us that you should be aware of is that we regularly update our website with current and pertinent information. We have one more layer of filtration since we place the greatest importance on reader satisfaction. Please let us know if any product included here is incorrect, irrelevant, subpar, or simply out of date. We always value your opinions, and we’ll work hard to make any necessary corrections to our list in response to them.

Why should you believe us?

There are now thousands of possibilities for these products on Amazon, but choosing the best one can be difficult and time-consuming. And what 18x 24 x 1 air filters should you purchase in 2022?

This guide is the result of more than 10 years of experience in researching, testing and writing about many topics. Each member of our team is an authority in their area. We read every article we could find online and every consumer review on every retail website for seven hours. Additionally, we discovered a ton of websites that offered helpful resources, including buying tips and thorough information on 18x 24 x 1 air filters.