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Support - What is the difference between Nominal size and Actual size?

This has become an industry standard that most air filter companies now use both of these measurements. Did you know: Filter measurements are usually rounded up to the nearest number?

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).

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