Custom Air Filters
Build your own custom AC or furnace filter
We have done our best to list all the major replacement sizes. However, if you don’t see the size for you, you can easily create it using this tool.
Simply measure the length and width of your filter with a tape measure and choose the closest size (to 1/8”) in the drop down menu. 1/8” tolerance is standard and should not cause a problem in any standard filter application.
Please note that the ‘actual’ filter size, ie the size that your tape measure shows, should be used when creating a filter with this tool, not a nominal filter size. You can read more about the difference between actual and nominal filter sizes here.
Note that depths of each filter are standard, as shown to the right: