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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.
C. Roberts
Reviewed in the United States on February 3, 2025
The 20x30x2 filters are hard to find locally and was glad to find them here. They work well and shipped without any damage. I’ll keep buying these.
Customer
Reviewed in the United States on February 27, 2025
Great quality!
Flyitfast
Reviewed in the United States on February 18, 2025
Perfect fit and healthy.
lise chamberland
Reviewed in Canada on January 26, 2025
La fabrication de ces filtres est très moyenne
PW in MD
Reviewed in the United States on January 16, 2025
The filters arrived in the proper shipping time frame. The filters were the correct size and the filter media seems to be correct. I immediately changed filters to the new filter. It fit and has been in service for more than 30 days without issue. I will look to this seller when I need additional replacements.
MJ
Reviewed in the United States on September 16, 2024
I recently purchased this product, and I am extremely satisfied! It is exactly as described—high quality, durable, and incredibly useful for everyday needs. The functionality is spot on, making it both practical and convenient to use. What impressed me most is that, despite its excellent quality, it’s very reasonably priced, making it a fantastic value. It’s clear that a lot of thought went into the design and performance, and it has exceeded my expectations. If you’re looking for a great product at an affordable price, I highly recommend this one!
WLS
Reviewed in the United States on March 25, 2024
The materials of this 20x25x4 filter seem to be of good quality and filter is made in USA. The filter dimensions are undersized and as a result loosely fits in the furnace track. 19-3/8 x 23-3/8 x 3-5/8. The filter gets sucked out of the frame and does not filter the air. The frame of the filter does not indicate it is a MERV 13: only a removable label. I would like to buy American but improvements need to happen with this filter.
GS
Reviewed in Canada on December 20, 2024
I recently purchased the 20x25x4 Air Filter MERV 13 Optimal Defense (4-Pack) and have been very satisfied. These pleated HVAC AC furnace air filters provide excellent filtration and have significantly improved the air quality in my home. They are easy to install and fit perfectly. Highly recommend for anyone looking for a reliable and efficient air filter.
James C. Fetterman
Reviewed in the United States on October 14, 2024
The four inch filters make a tight fit and can be a little difficult to put in, however, I still prefer them as they require less total time to put in.
John F. Rothermel
Reviewed in the United States on April 24, 2024
good price. quality seems good, just installed so no idea yet how they hold up.
Customer
Reviewed in Canada on April 11, 2024
I did a lot of research last year when our air quality was severe from the wild fires. I got a number of air purifiers but got these to try a home made one with a fan. I read a couple University papers on the topic and they recommended nothing less than 2 inches and this high of a hepa rating.I have a mild allergy to our dog and it can really affect my sleep. The small room purifier I didn't think was doing the job. So I took the homemade one and put it next to my bed. Wow! Utterly amazing. No snoring, no stuffy nose, just a fabulous sleep. And it was like you could feel the air was cleaner. So yes I highly recommend.
Wayne G
Reviewed in Canada on November 6, 2023
I ordered a quantity of 4 - 16x25x4" filters which were a better price than the Filtrete filters I've previously used.. These filters are certainly equal in quality... Will certainly order them again..
Donald Benedict
Reviewed in Canada on January 2, 2022
As you can see in the photos, the filter is 4” longer on the one side of my 20” box fan. I simply cut a piece of cardboard for that section and taped off everything to a good air seal. I keep the fan going in my back bedroom to cut down on the noise. I also operate it from 7 pm to 7 am on low. These are the lowest hydro rate times. I keep the furnace air vent wide open in that room and the door wide open too for good air circulation in my 850 square foot house. There is hardly any dust on my floors or in my house now. I used the big fan on high during bathroom renovations last month and little dust settlement. I can see I will have to change this filter at the three month mark because of the renovations. But the next one, I hope can extend for six months before replacement. Yes, the MERV 13 filters are expensive, but in these pandemic times, and me being 69 with health problems; my goal is the best air quality. I am quite happy with this simple portable solution. And hey, the 20” fan was $30.00 at Canadian Tire store. I saw an identical fan on Kijijii for $10.00. Fans are dirt cheap, but really do the air circulation job well for the filter operations.
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