Design Filters manufactures 4" pleated air filters that are guaranteed to fit your AC or furnace perfectly. If you don’t find your size listed below, don’t worry! You can easily create a custom filter using our custom filter tool. Rest easy knowing that our products are backed by a 30-day guarantee, meaning you never have to stress about selecting the wrong size. 4" air filters are coming soon!

Coming Soon

4" MERV 8

Coming Soon

4" MERV 11

Coming Soon

4" MERV 13