- 12x20x4 replacement air filters for your furnace, air conditioner, heat pump, or HVAC system (actual size: 11.50″ x 19.50″ x 3.75″). Please note that you may receive filters with a different label, frame, or media color than what is pictured. Any such alteration is purely cosmetic, meaning your air filter will function exactly as described regardless of the changes to these branded elements
- 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
From the brand
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At Filterbuy, we pride ourselves in being a one-stop shop for all of your air conditioner, furnace, or HVAC system filter replacements. This is why we offer over 600 custom sizes in a variety of filtration ratings to ensure that you can find the perfect fit, regardless of your unique needs. We do this in the pursuit of our goal to provide you, your family, and your community access to clean indoor air that enables you to live and breathe freely. -
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What makes our products unique?
We offer premium features that provide an enhanced filtration experience via a pleated, electrostatic design that captures more particles and a reinforced beverage board frame that withstands extreme temperatures.
What problem are we solving?
We give customers the ability to simply purchase the exact filter size they need from the comfort of their homes. Plus, our robust supply chain ensures that we can deliver these custom sizes quickly at no extra cost.
Why do we love what we do?
We love being able to provide a service that helps keep our communities healthy.
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Product Description
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Measurement System
Rates ability of filters to trap air particles on a scale of 1-20 (smallest microns captured at 20).
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Standard Protection (90%)
MERV 8 Air Filters (Silver)
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 (Gold)
Perfect for homes that want extra defense for factors like pets, smokers, or allergy-sufferers.
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Optimal Protection (98%)
MERV 13 Air Filters (Platinum)
Perfect for larger homes & businesses, and those who want the best possible filtration experience.
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Standard Protection (90%)
Odor Eliminator Air Filters with Activated Carbon
Perfect for homes that want to inhibit undesirable smells while maintaining reliable MERV 8 quality.
Next page1What is a MERV Rating?2MERV 83MERV 114MERV 135Odor Eliminator
Replacement Air Filter 12x20x4 (Actual Size: 11.50 x 19.50 x 3.75 Inches)
12x20x4 MERV 8 |
12x20x4 MERV 11 |
12x20x4 MERV 13 |
16x25x1 MERV 8 (Popular) |
20x20x1 MERV 8 (Popular) |
20x25x1 MERV 8 (Popular) |
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Customer Reviews
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4.0 out of 5 stars
74
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4.3 out of 5 stars
15
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4.8 out of 5 stars
5
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4.7 out of 5 stars
11,876
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4.7 out of 5 stars
13,459
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4.7 out of 5 stars
8,045
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Price
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$30.28$30.28 | $34.34$34.34 | $42.86$42.86 | $32.28$32.28 | $31.48$31.48 | $35.32$35.32 |
| Standard Home & Business | Superior Home & Business | Optimal Home & Business | Standard Home & Business | Standard Home & Business | Standard Home & Business | |
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Comparable Ratings
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MPR 600 & FPR 5 | MPR 1000-1200 & FPR 7 | MPR 1500-1900 & FPR 10 | MPR 600 & FPR 5 | MPR 600 & FPR 5 | MPR 600 & FPR 5 |
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Filtration Effectiveness
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90% Airborne Particles | 95% Airborne Particles | 98% Airborne Particles | 90% Airborne Particles | 90% Airborne Particles | 90% Airborne Particles |
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Particle Size
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3 – 10 Microns | 1 – 3 Microns | 0.3 – 1 Microns | 3 – 10 Microns | 3 – 10 Microns | 3 – 10 Microns |
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Dust & Debris
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✔ | ✔ | ✔ | ✔ | ✔ | ✔ |
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Mold & Pollen
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✔ | ✔ | ✔ | ✔ | ✔ | ✔ |
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Lint & Dander
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✔ | ✔ | ✔ | ✔ | ✔ | ✔ |
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Smog & Smoke
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✘ | ✔ | ✔ | ✘ | ✘ | ✘ |
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Bacteria
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✘ | ✘ | ✔ | ✘ | ✘ | ✘ |
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 16 x 1). Whereas the actual size is an exact measurement, normally in a smaller font, that depicts the filter’s precise dimensions (ex: 15.75 x 15.75 x .75). All filters have both.
Measuring Your Air Filters
If your current air filter does not have a dimension listed on the frame, use a tape measure to record the length x width 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.
Why should I change my air filter?
To maintain a healthy lifestyle, as breathing dirty air can put you at risk to develop asthma, allergies, and other respiratory ailments. Plus, old filters can cause system defects which may lead to unwanted expenses via energy costs and repairs.
Will these air filters fit my system?
Most of our filters are universally compatible, and will work with virtually any furnace, air conditioner, heat pump, or HVAC system. But if you see a specific brand name like Honeywell within a product title, then it is designed for an exact model.
How do I change my air filter?
Once you find the right size, turn off your power supply and remove the cover from your intake vent. You can then take out the old filter and dispose of it safely. Finally, just insert your new filter, replace the cover, and turn the power back on.
How often should I change my air filter?
How many air filters do I need?
This varies for every customer depending on specific needs like those referenced in the prior answer. However, our selection includes package quantities that range from 1 to 12 filters, so no matter what your situation may be, we’ve got you covered.
About Us
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Live Free and Breathe Freely
Our commitment to you
At Filterbuy, we care about the air you breathe because we know how important it is to maintaining a healthy lifestyle. This is why we work around the clock to assure that you, your family, and your community have access to clean indoor air, free of allergens and pollutants, that enables you to always live free and breathe freely.
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Over 600 Custom Air Filter Sizes
No matter the size, we have what you’re looking for
We now offer more than 600 different custom air filter sizes, because we know that when it comes to clean air, there isn’t a one-size fits all solution. This ensures that we can complete our mission of providing you value with a quality product that is sent directly to your door, regardless of your filtration needs.
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Where We Came From
Nearly 70 years of giving back to our communities
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 nearly 1,000 employees from all walks of life. 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.
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100% American Made
Local sourcing, manufacturing, and distribution
From our first air filter produced in 2013, we have proudly built our business in the USA, now manufacturing in Alabama, Florida, Pennsylvania, and Utah. This robust network gives us the unique ability to swiftly fulfill diverse, custom orders to households and businesses across the country.
