For air filters, the length and width dimensions are interchangeable, though conventionally the larger of the measurements is the width and the shorter of the measurements is the length. The smallest of the dimensions will almost always be the depth.
In some cases the length and the width are interchangeable, but you’ll always need to make sure that you measure for those 3 specific air filter or furnace filter dimensions.
Below you can see an example of an air filter size chart:
Find the right air filter size for you, once you properly measure your air filter and get the right dimensions, you can contact our sales to custom the products. Our filters are always customized, so we can produce different size and specification of filters. We always provide the ability to select performance rating of filter...