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Complete List of Furnace Filter Sizes with Actual Size and MERV ratings available

by Kevin King November 14, 2017

Complete List of Furnace Filter Sizes with Actual Size and MERV ratings available

Complete List of Air Conditioner / Furnace Filter Sizes with Actual Size and MERV ratings available

Listed in the chart below are the standard size 1 inch, 2 inch and 4 inch depth air conditioner filters for your AC, Furnace, HVAC at Atomic Filters. We also offer custom size filters. Select the size to see a collection of filter for that size. Need to know more about MERV ratings check out our air filter knowledge page. Filter are usually listed by the Nominal Size which is a rounded number, based off of the true dimensions of the filter which are called the "actual size". 

How Do I Find the Size of My AC Filter?

You can usually Find the Size of Your Air Conditioner filter right on the size of the frame of the filter. The Picture of this 12x12x1 inch air filter has the Nominal size which is the size by which air filters are generally sold. on the right of the filter it also includes the actual size of the filter which are the true measures dimensions of the filter by lenght width and depth. See air filter image:

Complete List of Furnace Air Conditioner Filters by Size

If there is no size on your current AC filter, you can measure the legnth width depth of the filter and the filter to find the Actual Size of your filter with the Corresponding Furnace Filter size in the Furnace Filter Size(Nominal Size) Chart.

How Often Should I Change My AC Filter?

General AC Filters are changed every 2 to 3 Months Depending on Use. Environments with  Smoke, heavy dust(ie Desert) or pets may need more frequent air filter changing. 

Furnace Filter Size (Nominal) Actual Size Good Better Best
10x10x1 9.5 x 9.5 x .75 MERV 8 MERV 11 MERV 13
10x20x1 9.5 x 19.5 x .75 MERV 8 MERV 11 MERV 13
10x24x1 9.5 x 23.5 x .75 MERV 8 MERV 11 MERV 13
10x30x1 9.5 x 29.5 x .75 MERV 8 MERV 11 MERV 13
12x12x1 11.75 x 11.75 x .75 MERV 8 MERV 11 MERV 13
12x16x1 11.5 x 15.5 x .75 MERV 8 MERV 11 MERV 13
12x18x1 11.5 x 17.5 x .75 MERV 8 MERV 11 MERV 13
12x20x1 11.5 x 19.5 x .75 MERV 8 MERV 11 MERV 13
12x24x1 11.375 x 23.375 x .75 MERV 8 MERV 11 MERV 13
12x25x1 11.5 x 24.5 x .75 MERV 8 MERV 11 MERV 13
12x30x1 11.625 x 29.5 x .75 MERV 8 MERV 11 MERV 13
12x36x1 11.5 x 35.5 x .75 MERV 8 MERV 11 MERV 13
14x14x1 13.5 x 13.5 x .75 MERV 8 MERV 11 MERV 13
14x15.5x.75 14 x 15.5 x .75 MERV 8 MERV 11 MERV 13
14x18x1 13.5 x 17.5 x .75 MERV 8 MERV 11 MERV 13
14x20x1 13.5 x 19.5 x .75 MERV 8 MERV 11 MERV 13
14x24x1 13.375 x 23.375 x .75 MERV 8 MERV 11 MERV 13
14x25x1 13.5 x 24.5 x .75 MERV 8 MERV 11 MERV 13
14x30x1 13.5 x 29.5 x .75 MERV 8 MERV 11 MERV 13
15x20x1 14.5 x 19.5 x .75 MERV 8 MERV 11 MERV 13
15x25x1 14.5 x 24.5 x .75 MERV 8 MERV 11 MERV 13
16x16x1 15.75 x 15.75 x .75 MERV 8 MERV 11 MERV 13
16x18x1 15.5 x 17.5 x .75 MERV 8 MERV 11 MERV 13
16x20x1 15.5 x 19.5 x .75 MERV 8 MERV 11 MERV 13
16x24x1 15.375 x 23.375 x .75 MERV 8 MERV 11 MERV 13
16x25x1 15.5 x 24.5 x .75 MERV 8 MERV 11 MERV 13
16x30x1 15.5 x 29.5 x .75 MERV 8 MERV 11 MERV 13
16x32x1 15.5 x 31.5 x .75 MERV 8 MERV 11 MERV 13
17x22x1 16.5 x 19.5 x .75 MERV 8 MERV 11 MERV 13
18x18x1 17.5 x 17.5 x .75 MERV 8 MERV 11 MERV 13
18x20x1 17.5 x 19.5 x .75 MERV 8 MERV 11 MERV 13
18x22x1 17.5 x 21.5 x .75 MERV 8 MERV 11 MERV 13
18x24x1 17.375 x 23.375 x .75 MERV 8 MERV 11 MERV 13
18x25x1 17.5 x 24.5 x .75 MERV 8 MERV 11 MERV 13
18x30x1 17.5 x 29.5 x .75 MERV 8 MERV 11 MERV 13
20x20x1 19.5 x 19.5 x .75 MERV 8 MERV 11 MERV 13
20x21.5x.75 20 x 21.5 x .75 MERV 8 MERV 11 MERV 13
20x21x1 19.5 x 20.5 x .75 MERV 8 MERV 11 MERV 13
20x22x1 19.5 x 21.5 x .75 MERV 8 MERV 11 MERV 13
20x24x1 19.375 x 23.375 x .75 MERV 8 MERV 11 MERV 13
20x25x1 19.5 x 24.5 x .75 MERV 8 MERV 11 MERV 13
20x30x1 19.5 x 29.5 x .75 MERV 8 MERV 11 MERV 13
21.5x23.25x.75 21.5 x 23.25 x .75 MERV 8 MERV 11 MERV 13
22x22x1 21.5 x 21.5 x .75 MERV 8 MERV 11 MERV 13
24x24x1 23.375  x  23.375  x  .75 MERV 8 MERV 11 MERV 13
24x30x1 23.5 x 29.5 x .75 MERV 8 MERV 11 MERV 13
25x25x1 24.5 x 24.5 x .75 MERV 8 MERV 11 MERV 13
30x30x1 29.5 x 29.5 x .75 MERV 8 MERV 11 MERV 13
30x36x1 29.5 x 35.5 x .75 MERV 8 MERV 11 MERV 13
2 Inch Deep Filters
10x20x2 9.5 x 9.5 x 1.75 MERV 8 MERV 11 MERV 13
12x12x2 11.5 x 11.5 x 1.75 MERV 8 MERV 11 MERV 13
12x20x2 11.5 x 19.5 x 1.75 MERV 8 MERV 11 MERV 13
12x24x2 11.375 x 23.375 x 1.75 MERV 8 MERV 11 MERV 13
12x25x2 11.5 x 24.5 x 1.75 MERV 8 MERV 11 MERV 13
14x20x2 13.375 x 19.375 x 1.75 MERV 8 MERV 11 MERV 13
14x25x2 13.375 x 24.375 x 1.75 MERV 8 MERV 11 MERV 13
15x20x2 14.5 x 19.5 x 1.75 MERV 8 MERV 11 MERV 13
16x16x2 15.5 x 15.5 x 1.75 MERV 8 MERV 11 MERV 13
16x20x2 15.5 x 19.5 x 1.75 MERV 8 MERV 11 MERV 13
16x24x2 15.375 x 23.375 x 1.75 MERV 8 MERV 11 MERV 13
16x25x2 15.5 x 24.5 x 1.75 MERV 8 MERV 11 MERV 13
18x18x2 17.5 x 17.5 x 1.75 MERV 8 MERV 11 MERV 13
18x20x2 17.5 x 19.5 x 1.75 MERV 8 MERV 11 MERV 13
18x24x2 17.375 x 23.375 x 1.75 MERV 8 MERV 11 MERV 13
18x25x2 17.5 x 24.5 x 1.75 MERV 8 MERV 11 MERV 13
20x20x2 19.5 x 19.5 x 1.75 MERV 8 MERV 11 MERV 13
20x24x2 19.375 x 23.375 x 1.75 MERV 8 MERV 11 MERV 13
20x25x2 19.5 x 24.5 x 1.75 MERV 8 MERV 11 MERV 13
20x30x2 19.5 x 29.5 x 1.75 MERV 8 MERV 11 MERV 13
24x24x2 23.375 x 23.375 x 1.75 MERV 8 MERV 11 MERV 13
24x30x2 23.5 x 29.5 x 1.75 MERV 8 MERV 11 MERV 13
25x25x2 24.5 x 24.5 x 1.75 MERV 8 MERV 11 MERV 13
25x28x2 24.5 x 27.5 x 1.75 MERV 8 MERV 11 MERV 13
30x36x2 29.5 x 35.5 x 1.75 MERV 8 MERV 11 MERV 13
4 Inch Deep Filters
12x24x4 11.375 x 23.375 x 3.625 MERV 8 MERV 11 MERV 13
16x20x4 15.375 x 19.375 x 3.625 MERV 8 MERV 11 MERV 13
16x25x4 15.375 x 24.375 x 3.625 MERV 8 MERV 11 MERV 13
18x24x4 17.375 x 23.375 x 3.625 MERV 8 MERV 11 MERV 13
20x20x4 19.375 x 19.375 x 3.625 MERV 8 MERV 11 MERV 13
20x24x4 19.375 x 23.375 x 3.625 MERV 8 MERV 11 MERV 13
20x25x4 19.375 x 24.375 x 3.625 MERV 8 MERV 11 MERV 13
24x24x4 23.375 x 23.375 x 3.625 MERV 8 MERV 11 MERV 13
25x29x4 24.375 x 28.375 x 3.625 MERV 8 MERV 11 MERV 13

 




Kevin King
Kevin King

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Nominal Vs. Actual Sizes: Finding the Right Air Filter Size

Buying the Correct Size Air Filter- The Most Important Thing to Know 

When you are buying your air filter online most important thing to know is Air Filters have two sizes that you need to understand the Nominal size and the Actual Size. Not understanding these numbers often leads to consumers purchasing a filter that does not fit their Furnace or HVAC system.

Nominal vs Actual air filter size by Atomic

 

Understanding Nominal Filters Size Could Save You Time and Money

Not understanding the Nominal Filter Size is the primary culprit for incorrectly purchased filters.The Nominal Size are the usually the dimensions used to Label the filter. For instance 16x20x1. These dimensions are a rounded value on the filters actual measurements. The actual measurements on this filter may be 15.5x19.5x.75, but that could vary by brand and manufacturer. So in order to make sure you have the correct size filter, especially if you are replacing with a different brand it is important to confirm the actual size on the filter. When purchasing filters on the internet the Nominal size is usually found the in the product title.

Actual Filter Size- The Key to Making the Right Replacement Filter Purchase

The actual size as you might have guessed are the actual dimensions of the filter by length, width and thickness. This size is often on the filter right below the Nominal size and is usually labeled as the actual size. When you are buying a filter online the actual size is sometime in the product bullet point or the product description. If your filter does not have actual dimensions on the outside of the filter, you can measure you filter to get the correct dimensions. Some brands have a foam gasket on the outside of the filter, in this case you will want to make sure you have a compatible actual size size and that it also has the foam to insure a snag fit. 

Lennox Air Filter X0851 with Foam strips

Examples of Nominal and Actual Sizes

 Size  Example 1  Example 2
Nominal Size 20x20x1 16x20x1
Actual Size 19.5x19.5x.75 15.75x19.75x.75

 

 Furnace filters should fit securely but should not have to be forced into position. If you have to force the filter into its slot, then it is probably too big. Forcing an improper filter size in a filter can cause it to buckle, damaging the filter or reducing its ability to function properly. Filters are a smaller than their slot to allow for easy replacement. Some HVAC units may need a filter with dimensions that are unique or uncommon. In these cases, a custom filter needs to be ordered.

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