Nominal vs Actual Air Filter Sizes: A Guide for Homeowners
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.
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