Complete List 1" , 2, 4" Air Filter Sizes - Atomic Filters
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Complete List of 1" , 2, and 4" Air Filter Sizes with Actual Size and MERV ratings available

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Complete List of Whole House Brands and 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. Also listed are the whole house air filters collections carried by Atomic Filters.

Find You Furnace Filter by Size or Brand

In addition to carrying major brands of furnace filters like Lennox, Carrier, Trion Air Bear and Skuttle we also offer custom size filters at Atomic. Select the size to see a collection of filter for that size or select your Brand and see the entire collection of Whole-house furnace filters available. Need to know more about MERV ratings check out our air filterknowledge 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. 

Find Your Filter by Brand

Click the link for the brand to see the entire collection. Use the search to find your item by Model, Title or Size. See the complete expanded list of filters by Brand Size and actual size.

 

 Whole House Filters by Brand Model Size
Lennox  See all
Honeywell See all
Aprilaire See all
Carrier / Bryant See all
Toptech See all
Totaline See all
Trion Air Bear See all
Skuttle See all

Find Your Furnace Filter by Size

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

 

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