Complete List of 1 inch , 2 inch , and 4 inch Air Filter Sizes with Actual Size and MERV ratings available

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:

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.

Find Your Furnace Filter by Size