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Understanding Nominal and Actual Measurements for Filters

By June 25, 2018November 29th, 2020No Comments

Need a replacement air filter?

There’s a lot of talk about actual vs nominal measurements for filters and we’re here to help clear up any questions you may have.

Actual measurement: The measurement you get when you measure the filter yourself (Usually will include ¾ and ½ sizes).

Nominal measurement: The measurement printed on the side of the filter (Rounded up to the nearest number).


Did you know: Filter measurements are usually rounded up to the nearest number?

While using a tape measure will give you the most accurate measurement of your filter, you will need to round up the numbers to match them with a filter size.

When in doubt order the nominal measurement if possible.

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Here’s a quick video to help clear things up: is a replacement water and air filter company located in the United States. The views and opinions contained herein are solely those of the original author and do not represent Eco Blue Life or its affiliates. This article was originally published on  
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