I just removed a Honeywell filter and put my new Filter.com filter in. Both have the same dimensions on the label 20x25x4, but the Filter.com is at least 1/2 shy of what is labeled. It LOOSELY fits in the furnace. I pray I have no issues with it
These are the only filters we buy and use. They work well and the brand can be trusted. And while this isnt the only reason, their price for a box of three is great.