The fit was a little tight and had to push hard to get it in, I measured it against the original filter that came with the unit, and it didn't seem to be any difference in size. The original filter had metal frame so I wonder if that meant a closer tolerance, the Filterbuy filter is cardboard framed which by it's nature has a higher friction coefficient.
Great company. The filters are the best have ever used. It is hard to find filters that are 2 inches thick. They ship right away and are reasonably priced.
I bought the medium quality.I can see lots of daylight thru the pleat area I would say holes. Havent installed just put last filter a furnace install company had made for me in Silicon Valley. Also side by side with old filter half inch wider..will see and get back in future.