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Your cart is empty.Product Description
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Measurement System
Minimum Efficiency Reporting Value (MERV)
Rates the ability of filters to trap particles on a scale of 1-20 (smallest microns captured at 20).
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Standard Protection (90%)
MERV 8 Air Filters
Perfect for almost any home or business that wants great indoor air quality at a reasonable rate.
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Superior Protection (95%)
MERV 11 Air Filters
Perfect for homes or businesses accounting for factors like pets, smokers, and allergy sufferers.
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Optimal Protection (98%)
MERV 13 Air Filters
Perfect for larger homes or businesses, and those who want the best possible filtration experience.
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Odor Eliminator (90%)
MERV 8 Air Filters with Activated Carbon
Perfect for homes or businesses that want to inhibit unpleasant smells with reliable MERV 8 quality.
Choosing the Correct Filter Size
Nominal Size vs. Actual Size
The nominal size is a shorthand number rounded to the nearest whole or half inch, normally in a larger font (ex: 16 x 20 x 1). Whereas the actual size is an exact measurement, normally in a smaller font, that depicts the filter's precise dimensions (ex: 15.50 x 19.50 x 0.75). All filters have both.
Measuring Your Air Filter
If your current air filter does not have a dimension listed on the frame, use a tape measure to record the width x length x depth to find the actual size. Then round these measurements up to the nearest inch to find a corresponding nominal size, which will be easier to locate when searching online.
About Us
- The video showcases the product in use.The video guides you through product setup.The video compares multiple products.The video shows the product being unpacked.
Better Air For All
Championing indoor air quality
At Filterbuy, we care about the air you breathe because we consider it the foundation for maintaining a healthy lifestyle. Cleaner air is always better, and we are firm believers that everyone, everywhere deserves to breathe it. This is why we work around the clock to ensure that you, your family, and your community have access to clean indoor air, free of allergens and pollutants, that enables you to routinely live free and breathe freely.
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Finding the Perfect Fit
No matter the size, we've got you covered
We now offer a variety of expert services and hundreds of custom air filter sizes that are compatible with a near infinite number of systems, because we know that when it comes to clean air, there isn’t a one size fits all solution. This enables us to always provide value with a quality product that empowers you to protect your home or business, regardless of your filtration needs.
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Green Means Clean
Refreshing new look, same great quality
Our new, green frames are constructed with the same high quality materials that you have grown accustomed to. We made the decision to switch to this greener design to help symbolize the peace of mind that comes from knowing your home or business is being properly cared for. When you see Filterbuy green, you can exhale with the confidence that you are breathing crisp, pure, fresh air.
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100% American Made
Local sourcing and manufacturing
From our first air filter produced in 2013, we have proudly built our business in the USA, now manufacturing in Alabama, California, Florida, Illinois, North Carolina, Pennsylvania, Texas, and Utah. This robust, homegrown network gives us the unique ability to swiftly fulfill diverse, custom orders directly to the doors of households and businesses across the country at premium rates.
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Subscribe and Save
Don't let changing your filter be a burden
The nature of air filters requires them be replaced regularly, but opting into a subscription service can help to simplify that process. All you need to do is find the right product and choose the delivery interval. We do the rest by making sure your filters arrive on time as requested. The majority of our Amazon catalog is already eligible for the program, and you even get a discount on every delivery when you enroll, making it an easy choice.
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Where We Came From
Nearly 70 years of giving back
Our small, family-owned and operated company has evolved since its inception in 1958 to the filtration business that you know and love today with thousands of employees serving millions of customers. As our team continues to expand to new neighborhoods across the country, we make sure to stay true to our values by keeping our commitment to community investment and personal aid at every possible opportunity.
RealDealReviews
2025-09-03 16:06:28
The Filterbuy 20x25x4 Air Filter MERV 8 Dust Defense 2-Pack is an excellent choice for those looking to improve the air quality in their home without breaking the bank. It offers solid performance, ensuring your HVAC system runs smoothly and efficiently while capturing airborne particles that can affect your health.Pros: • Good filtration performance: With a MERV 8 rating, these filters do a great job of capturing dust, dirt, pollen, and pet dander. It’s a balanced option for improving air quality in most residential settings without being overly restrictive. • Affordable price: For a two-pack, this filter set offers good value for the money. It provides long-lasting filtration that’s budget-friendly. • Easy to install: These filters fit well and are simple to swap out, which is a huge plus when it’s time for a change. It fits standard HVAC systems and makes maintenance a breeze. • Sturdy construction: The pleated design ensures that the filters are durable and can handle regular use without warping or falling apart.Cons: • Not the highest MERV rating: While MERV 8 is sufficient for most homes, it might not be enough for those with allergies or respiratory issues who need finer filtration. If that’s the case, consider looking for higher MERV options. • Size precision: The listed size is nominal (20x25x4), but the actual size is slightly smaller, so be sure to double-check your system’s dimensions to ensure a snug fit.Overall, the Filterbuy 20x25x4 Air Filter MERV 8 is a solid choice for standard home air filtration. It’s budget-friendly, reliable, and does its job well for general dust and allergen control. If you’re looking for good filtration without needing the highest MERV rating, this is an excellent option.
J.E. Aulik
2025-09-02 10:59:14
Impossible to find the right MERV filter in stores around here. Previous owners of the house cracked the heat exchanger with wrong filters so I want to use what the manufacturer recommends.
Louie16hp
2025-07-07 10:26:08
These are very easy to use and they fit exactly to scale and thickness. They were highly approved by our AC company and said they are working great for our system. We subscribe and save these every 6 months because the build quality is so well structured and the are filter has significantly helped the air quality of the house.
Genie
2025-06-19 17:27:53
Good price and quality. These are slim fit i.e. thinner than 4 inches. Description clearly stated this but I missed it. Our HVAC filter housing is 4.5 inches so these don't fit properly. Had to tape them in to ensure the air flow doesn't go around them.
DDusa
2025-06-07 19:16:28
These filters work very well. They are slightly down sized which makes them easier to remove and replace. I use to buy the more expensive filters but these are just as good for less money. It’s a no brainer.
Kathryn Miskokomon
2025-06-01 18:26:34
Product Review: 25â€x25â€x4†Furnace Air FiltersI recently purchased the 25â€x25â€x4†furnace air filters, and I’m extremely satisfied with both their performance and affordability.Performance: These filters work exceptionally well in maintaining air quality and ensuring efficient furnace operation. They fit perfectly and effectively capture dust, allergens, and other particles, contributing to a cleaner and healthier home environment.Affordability: One of the standout aspects of this purchase was the cost. I compared prices with big box stores, where the same filters were priced at twice the amount. Not only did I get high-quality filters, but I also saved a significant amount of money.Value for Money: Given their performance and the substantial savings compared to retail prices, these filters offer excellent value for money. They prove that you don’t have to spend a fortune to get quality air filtration.Conclusion: If you’re in need of reliable and cost-effective furnace air filters, I highly recommend the 25â€x25â€x4†filters. They deliver great performance at a fraction of the price you’d pay elsewhere, making them a smart choice for anyone looking to keep their air clean without breaking the bank.
Doug
2025-05-23 13:27:22
Works as good as others that cost more. This 2pack was economical for mor frequent changing. Exact measurements are slightly less than described
Stephen C. Ware
2025-04-29 09:45:18
Buyer beware for certain. I placed an order to Filterbuy through Amazom for a set 20x25x4 and 16x25x4s air filters. The large box arrived and I opened it to find two sets of filters. The first set was the 20x25x4s but the second set were 16x20x4s. Not what I ordered. So I started an Amazon return. Hey… everyone makes a mistake right? The return is initiated and I return the first set of incorrect filters. I receive notice Through Amazom that the replacement set is on the way. Great!So I receive the second set in a box that looks too small to contain my order. Why might that be? Because it was. The air filters that were sent were (8) 14x25x1 Filters. What! So I start another return and ask for the full refund. You would have though because it was filterbuy's error that they would pay the shipping, right. NO…Here is Filterbuys return policy statement.“Please note that if your order was fulfilled correctly and you would still like to return the item, you are more than welcome to do so. However, in many of these scenarios you will be responsible for the return shipping cost, which is generally very expensive due to the nature of our mostly oversized product selection. If you have any questions related to whether or not you would be liable for the cost of the return shipping label, please contact our support team.â€There was no method offered where I didn't have to pay shipping for their mistake. Not a good policy. I ended up paying more for Filterbuy not fulfilling my order. If you don’t mind paying the extra for their mistakes and terrible return policy to get your refund then please ignore my review and continue with your purchases.
Pierre Levesque
2025-04-08 10:27:47
un peu chers
Rd
2025-04-04 14:38:55
Works well, no need to spend more on any other brand.
R Irwin
2025-03-18 17:00:39
These filters are great - they arrived in record time and in perfect condition. They are as described and I am very pleased with them.
Michel Giroux
2025-02-22 19:52:48
système de chauffage.Prix assez élevé toutefois , par rapport à la compétition
Pascal Grenier
2025-01-15 13:27:57
I recently purchased the Filterbuy air filter, hoping to improve the air quality in our home. My expectations were high: I was looking for a product that was effective in filtering dust and allergens, while being simple to install and maintain.This air filter with a standard size that fits the majority of domestic ventilation systems. Designed for optimal defense against dust, it promises to capture a wide range of particles and allergens, contributing to a healthier indoor environment.Upon installation, I noticed a significant difference. Air quality has improved, and the effects on our daily comfort are undeniable. I particularly appreciated the ease of installation and the manufacturing quality of the product. However, I must admit that the regular replacement required might be a weak point for some.Overall, the quality of this Filterbuy air filter is impressive. It effectively fulfills its primary mission: purifying the air. Durability seems to be there, although time will tell more on this point.Benefits:- Remarkable efficiency in capturing particles.- Ease of installation.- Good value for money.Disadvantages:- Need for periodic replacement.- Perhaps slightly more expensive than other basic options.Compared to other filters of similar size, the Filterbuy stands out for its ability to filter a wider variety of particles. Its solid construction also makes it more durable than some competitors.For maximum efficiency, it is recommended to check and replace the filter every 6 months, depending on usage and air quality in your area.If you're looking to improve your home's air quality with a reliable product, the Filterbuy air filter is a great choice. Its effectiveness, quality and ease of use make it a major ally for a healthier indoor environment.
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