Your cart is empty.
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.
LouisFL
2025-08-11 18:08:08
These are a great value! They are reliable and efficient, and the price for 4" filters is hard to beat.
german
2025-08-10 17:20:05
Works as expected!
Michael D Bailey
2025-07-01 17:18:41
I can’t believe I found a filter that actually fits the EXACT dimensions of my existing filter. Order arrived on time and undamaged. Decent price and it works as advertised. MERV11 is among the highest rated and best HVAC. filters on the market.
Lavelle Adams
2025-06-27 16:38:06
It helps to keep the air in my home fresh. Easy to install and good quality.
RS
2025-06-18 12:46:21
Good filters that save you $$$
James
2025-05-22 10:42:16
These filters fit exactly as described and are well constructed. I will buy these again.
Danno M
2025-04-23 12:53:04
These are perfect for our HVAC. It's an unusual size to try to find locally.
RJ
2025-04-05 17:03:18
Well made and sized
Slim1250
2025-03-05 15:56:01
Had a hard time finding this size of filter prior to Amazon. Although I experienced a problem with the shipping, both Amazon and Filterbuy worked quickly to resolve the issue through their excellent customer support.Very pleased with the quality and the price.
Sylviolin
2025-01-19 10:05:02
I am replacing my filter labelled 18x18x1 (the actual size is 17.5" x 17.5" x 0.75")My research led me to Amazon for Filterbuy 18x18x1 Merv 11 (6 pack Gold). The item was described as actual size 17.75"x17.75"x0.75"). Their video showed 17.5"x17.5"x3/4- which was contradictory. The other brand sold by Amazon was 50% more expensive and $19 shipping cost on top.I decided to take my chance with Filterbuy with worst case scenario of returning the product, if it does not fit.It turned out that the actual size is 17.5"x17.5"x3/4" which is exactly what I was looking for. They are good quality filters, well packaged and easy to install. Totally recommend.EDITHappy to see that the product actual size has now been changed to 17.5"x17.5"x3/4.
V.G
2025-01-16 17:37:10
I was very satisfied with the filters. Good service, excellent product. I now know where to buy my filters.Thank you gentlemen.
Emna
2025-01-04 19:33:33
C’est bon
Jeff D
2024-12-04 18:13:29
Exactly the size I needed. Arrived quickly and in perfect condition.
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