I appreciate that Filterbuy lists the EXACT measurements on their filters. These filters fit our Byrant furnace perfectly. They were also packaged very well.
We ordered 20x25x4 filters (Merv 11) for two new HVAC systems, however, once installed, the "4 inch" width was WAY too small for the opening in the air handler. They're just leaning loosely in the filter slots. NOT effectively filtering all the air going through the system! We should have gone with the Honeywell brand filter instead of trying to save some money.
As a retired HVAC business owner I know how expensive it can be to purchase filters of odd size. Most suppliers can order them, but only at a premium. Nice to find ones at regular pricing.