What Are the Different Sizes of Air Conditioner Air Filters?

If you want to keep your air conditioner running smoothly and efficiently, it's important to replace the air filter regularly. But how do you know what size air filter to buy? In this article, we'll explain how to measure the size of your air filter and where to find the right replacement. The first step is to measure the length and width of your existing air filter. If it's not a square, the smallest measurement should come first. You can also check the description or vignettes of the location HEPA filters for sale to make sure you buy the right one for your air purifier. If you don't have the old filter handy, you'll need to measure the intake hole to determine the actual size of the air filter.

It's best to buy your replacement air filters from a trusted manufacturer like Filterbuy. Filters are usually listed by their nominal size, which is a rounded number based on their actual dimensions. Filter King offers hundreds of different filter sizes that can be used in various household systems, including ovens. If you have a system that uses a whole house filter, you may have an option from MERV 8 to MERV 16, depending on your HVAC system. If you have a system that has the option of a high-efficiency MERV 15 filter, such as Bryan and Carrier offer germicidal air purifiers, then you'll need to check the part number of your existing filter. The Lennox filter below shows part number X0583 and Honeywell part numbers FC100A1029 and FC35A1001, which this filter can replace on the actual filter (see the Lennox filter image below with the number and size of the item in the filter along with compatible filters).

When replacing the air filter, most people will find the nominal size or dimensions on the edge of their current air filter. Filters are measured by nominal size, which is a rounded number that varies by brand. So many filters have a list of compatible brands and their part numbers.