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Shop by AC and Furnace Filter Sizes

Select Your Size

Whether you're looking for popular, hard to find, or custom HVAC filter sizes, Air Filters Direct has them. The first step to finding yours is to find the AC filter size listed on your current filter. If the size isn't printed on it, you can simply measure it by following the instructions in our Helpful Tips. Keep in mind when ordering that the size category goes by the depth of the filter. For example, a 2" filter will measure two inches deep.