What Are the Different Sizes of Air Filters?

When it comes to air filters, the standard size is usually 1-inch thick. However, some homes are equipped with thicker filters that can withstand more build-up and trap more particles than a standard filter. These thicker filters can sometimes restrict airflow, so it's important to make sure they fit snugly into the air filter compartment, leaving some space around the edges. When shopping for an air filter, you may come across two different sizes: the nominal size and the actual size.

The nominal size is used to match the correct filter to the appropriate slot for the air filter, but there's no need for an airtight seal between the frame and the air filter. The actual size is what you should look for when buying your air filter online. It's important to know that you should look for both the nominal size and actual size. If your filter doesn't have the actual dimensions on the outside of the filter, you can measure it to get the correct dimensions.

The length, width and depth of a filter are printed in small numbers along the filter frame, on the cardboard edge of a Filter King brand filter. It's also helpful to watch YouTube videos that explain how to assemble the air filter you want to buy. Lastly, make sure that the sizes of your air conditioner and oven filters are smaller than the measurements of the filter compartment. As an expert in air filtration systems, I recommend that you always check both the nominal size and actual size of an air filter before purchasing it. This will ensure that you get a filter that fits properly in your home and won't restrict airflow.

Additionally, make sure that any other filters in your home are smaller than the measurements of their respective compartments.

Catherine Plessner
Catherine Plessner

Devoted bacon trailblazer. Subtly charming burrito aficionado. Infuriatingly humble coffee advocate. Certified foodaholic. Incurable sushi guru. Award-winning travel lover.