In addition to the many standard filter sizes we offer, you can also order custom filters to fit your needs. Sizes can be customized down to an 1/8th of an inch and are only sold in cases of 4 filters. Please also note that non-standard filters are made to order and require a few extra days to produce. Because of this, they are also non-returnable. If you need assistance determining the correct size filter, please feel free to give us a call at 866-863-1262.
Nominal vs. Standard
Many consumers are surprised to find that the size printed on a filter is not the exact size of the filter itself. The size advertised is called the "nominal size" and is rounded up from the "actual size." All of our standard filters are listed as the nominal size, which is rounded up from the exact size. The actual size of our standard filters is 1/2" undercut from the nominal size. So, if you are going to order a standard 16 x 25 x 1" filter, the actual size of the filter is 15.5 x 24.5 x .75". Keeping this tidbit in mind will help you determine if your filter is truly a non-standard filter.
When ordering a truly non-standard filter, take the exact, or actual, measurements of the width and height of the filter. Non-standard filters are only available in a nominal 1" depth. Again, we are here to help so reach out with any questions.