Nominal vs Actual Air Filter Sizes: A Guide for Homeowners

January 22, 2023

When it comes to air filters, there are two sizes you may come across: the "nominal" size and the "actual" size. The nominal size is the size you see printed on the filter package, and it is rounded up to the nearest whole inch. This is the size that you would typically use when searching for a replacement filter.

The actual size, on the other hand, is the precise measurement of the filter down to one eighth of an inch. It is accurate and specific, but it can be difficult to work with when trying to find a replacement filter. That's where the nominal size comes in - it's a standardized measurement that makes it easy for you to find the right filter for your home without having to worry about precise measurements.

For example, a filter with a nominal size of 14"x14"x1" may have an actual size of 13 ¾" x 13 ¾" x ¾". The difference may seem small, but it can make a big impact when it comes to the efficiency of your air filter.

It's important to keep in mind that clean air is crucial for our health, that's why it's essential to make sure that you're using the right size air filter for your home. By understanding the difference between nominal and actual sizes, you can ensure that your air filter is doing its job effectively, to keep you and your family healthy. So, stay healthy and breathe easy, knowing that you have the right air filter for your home.

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