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Filterbuy 20x20x4 Air Filter MERV 11 Allergen Defense (2-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 19.38 x 19.38 x 3.63 Inches)

4.5 4.5 out of 5 stars 950 ratings

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Purchase options and add-ons

Brand Filterbuy
Material Polyester, Aluminum, Plastic
Product Dimensions 19.38"L x 19.38"W x 3.63"Th
MERV Rating 11.00
Compatible Devices Air Conditioner, Heat Pump, Air Cleaner, Furnace
Item Weight 6 Pounds
Product Grade Replacement Parts

About this item

  • 20x20x4 replacement air filters for your furnace, air conditioner, heat pump, or HVAC system (actual size: 19.38" x 19.38" x 3.63")
  • 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
See more product details

Customer ratings by feature

Sturdiness
4.4 4.4
Easy to install
4.4 4.4
Value for money
3.9 3.9
Sheerness
3.5 3.5

Frequently bought together

$50.24 ($25.12/Count)
Get it as soon as Tomorrow, Mar 29
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$45.04 ($22.52/Count)
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$49.36 ($24.68/Count)
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Product Description

smiling man piggybacks daughter in clean house as filterbuy air filters help them breathe freely

Replacement Air Filter 20x20x4 (Actual Size: 19.38 x 19.38 x 3.63 Inches)

gold merv 11 banner badge

20x20x4 MERV 11

silver merv 8 banner badge

20x20x4 MERV 8

platinum merv 13 banner badge

20x20x4 MERV 13

silver merv 8 banner badge

16x25x1 MERV 8 (Popular)

silver merv 8 banner badge

20x20x1 MERV 8 (Popular)

silver merv 8 banner badge

20x25x1 MERV 8 (Popular)

Customer Reviews
4.5 out of 5 stars
950
4.6 out of 5 stars
2,142
4.3 out of 5 stars
1,649
4.7 out of 5 stars
11,804
4.7 out of 5 stars
13,425
4.7 out of 5 stars
8,000
Recommended Use
Superior Home & Business Standard Home & Business Optimal Home & Business Standard Home & Business Standard Home & Business Standard Home & Business
Comparable Ratings
MPR 1000-1200 & FPR 7 MPR 600 & FPR 5 MPR 1500-1900 & FPR 10 MPR 600 & FPR 5 MPR 600 & FPR 5 MPR 600 & FPR 5
Filtration Effectiveness
95% Airborne Particles 90% Airborne Particles 98% Airborne Particles 90% Airborne Particles 90% Airborne Particles 90% Airborne Particles
Particle Size
1 - 3 Microns 3 - 10 Microns 0.3 - 1 Microns 3 - 10 Microns 3 - 10 Microns 3 - 10 Microns
Dust & Debris
Mold & Pollen
Lint & Dander
Smog & Smoke
Bacteria
anatomy of an air filter blown out photo where the wiring pleats and frame are all shown separately

Choosing the Correct Filter Size

zoomed photo of white air filter frame showing nominal and actual size of 16x16x1 filter in green

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.

smiling man in blue holds extended tape measure in front of him to show how to measure an air filter

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?

We generally recommend replacing your filter every 90 days to keep your system running efficiently and air clean. But, this is subject to change based on filter size and variable factors for pet owners, allergy-sufferers, homes with children, etc.

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.

Product information

Technical Details

Additional Information

Warranty & Support

Amazon.com Return Policy:Amazon.com Voluntary 30-Day Return Guarantee: You can return many items you have purchased within 30 days following delivery of the item to you. Our Voluntary 30-Day Return Guarantee does not affect your legal right of withdrawal in any way. You can find out more about the exceptions and conditions here.
Product Warranty: For warranty information about this product, please click here

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Filterbuy 20x20x4 Air Filter MERV 11 Allergen Defense (2-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 19.38 x 19.38 x 3.63 Inches)


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Filterbuy 20x20x4 Air Filter MERV 11 Allergen Defense (2-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 19.38 x 19.38 x 3.63 Inches)
Filterbuy 20x20x4 Air Filter MERV 11 Allergen Defense (2-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 19.38 x 19.38 x 3.63 Inches)
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Price$50.24$76.99$70.74-5% $64.49
List:$67.99
$38.17$43.66
Delivery
Get it as soon as Tomorrow, Mar 29
Get it as soon as Tomorrow, Mar 29
Get it as soon as Tuesday, Apr 2
Get it as soon as Tomorrow, Mar 29
Get it as soon as Tomorrow, Mar 29
Customer Ratings
Sturdiness
4.4
4.3
4.6
4.3
4.7
4.1
Easy to install
4.4
4.6
5.0
4.3
4.7
4.5
Value for money
3.9
4.3
5.0
3.8
4.5
4.1
Sold By
Filterbuy
Filter Pro
Filterbuy
Amazon.com
Filterbuy
Filterbuy
compatible devices
Air Conditioner, Furnace, Heat Pump, Air Cleaner
Furnace, Air Conditioner
Air Conditioner, Furnace, Heat Pump, Air Cleaner
Air Conditioner, Furnace
Air Conditioner, Furnace, Heat Pump, Air Cleaner
Air Conditioner, Furnace, Heat Pump, Air Cleaner
MERV rating
11
11
11
12
11
13
number of items
1
2
1
2
1
1
material
Plastic, Aluminum, Polyester
Plastic, Aluminum, Polyester
Electrostatically charged filter media
Plastic, Aluminum, Polyester
Plastic, Aluminum, Polyester

Customer reviews

4.5 out of 5 stars
4.5 out of 5
950 global ratings

Customers say

Customers like the value and performance of the air filter. For example, they mention that it works great and is more than adequate to do the job. That said, some complain about the fit. Opinions are mixed on quality.

AI-generated from the text of customer reviews

21 customers mention18 positive3 negative

Customers like the value of the air filter. They mention that it's an excellent value, more affordable as a 2 pack, and reasonable.

"These filters were good quality at a reasonable price. Unfortunately, they were not the correct size...." Read more

"...They also have a MERV rating of 11 which is very good. The price is also must better on Amazon than local stores where I pay almost that much for 1..." Read more

"...Other than that good price and product." Read more

"...Great value." Read more

16 customers mention16 positive0 negative

Customers are satisfied with the performance of the air filter. They mention that it works great, is more than adequate to do the job, and is a great product.

"The furnace filters fit fine and they work well." Read more

"...Ah, relief for my system. Excellent product." Read more

"...Easy to install and does the job." Read more

"...a little smaller than 4 inches, but I believe they are more than adequate to do the job. What I love the most is they're good for 12 months...." Read more

33 customers mention17 positive16 negative

Customers are mixed about the quality of the air filter. Some mention it's a good quality filter with excellent filtration, while others say it'll leave huge gaps and is poorly constructed.

"Filters arrived early and fit perfectly in my furnace. The filtration is great. Price is a little high, but everything is higher priced these days...." Read more

"...Second off... these are very cheaply constructed. Not sturdy and the pleats are not spaced out evenly at all......" Read more

"These filters were good quality at a reasonable price. Unfortunately, they were not the correct size...." Read more

"...when they arrived, one was poorly assembled and had an opening through the filter material near one edge, and the other had its pleats unevenly..." Read more

70 customers mention18 positive52 negative

Customers are dissatisfied with the fit of the air filter. They mention that the sizing was different, the filters were smaller than expected, and about 1/2" short on all dimensions. They also say that the filters fit loosely in the intake framing and did not fit their opening.

"...It turned out that their sizing was different. Mine said 20/20/4" and with them I needed a 20/20/5"...." Read more

"...to the measurements our a/c tech told us, but these filters were slightly too small...." Read more

"Filters arrived early and fit perfectly in my furnace. The filtration is great. Price is a little high, but everything is higher priced these days...." Read more

"An OK filter overall. the dimensions are slightly undersize when fitted inside my filter box." Read more

Theyre not size described! Read fine print!!
1 Star
Theyre not size described! Read fine print!!
Like...? I understand that these are cheaper but they're sacrificing way too much to save pennies in manufacturing. I don't understand how these filters have such good reviews unless many of the reviewers don't understand how much damage can be done to your HVAC system with an improperly sized filter.First off...never thought Id have to read fine print for ACTUAL filter dimensions. These are about 1/2" short on all dimensions which would allow dirty air to travel around it and get into the evaporator...pretty much useless! Depth isn't as important but length and width are pretty criticalSecond off... these are very cheaply constructed. Not sturdy and the pleats are not spaced out evenly at all...Air will take the path of least resistance which in this case would be around the filter instead of through it. Youve been warned...
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Top reviews from the United States

Reviewed in the United States on November 22, 2022
3 people found this helpful
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Reviewed in the United States on March 16, 2024
Reviewed in the United States on December 10, 2021
3 people found this helpful
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Reviewed in the United States on December 22, 2023
Reviewed in the United States on January 11, 2024
Reviewed in the United States on February 19, 2024
Reviewed in the United States on December 23, 2023
Reviewed in the United States on December 30, 2022
Customer image
1.0 out of 5 stars Theyre not size described! Read fine print!!
Reviewed in the United States on December 30, 2022
Like...? I understand that these are cheaper but they're sacrificing way too much to save pennies in manufacturing. I don't understand how these filters have such good reviews unless many of the reviewers don't understand how much damage can be done to your HVAC system with an improperly sized filter.

First off...never thought Id have to read fine print for ACTUAL filter dimensions. These are about 1/2" short on all dimensions which would allow dirty air to travel around it and get into the evaporator...pretty much useless! Depth isn't as important but length and width are pretty critical

Second off... these are very cheaply constructed. Not sturdy and the pleats are not spaced out evenly at all...

Air will take the path of least resistance which in this case would be around the filter instead of through it. Youve been warned...
Images in this review
Customer image Customer image Customer image Customer image
Customer imageCustomer imageCustomer imageCustomer image
One person found this helpful
Report

Top reviews from other countries

Northern Guy
5.0 out of 5 stars Fits my furnace !
Reviewed in Canada on October 5, 2023
Ina Wright
5.0 out of 5 stars great product
Reviewed in Canada on December 6, 2023