I would like a standard air filter to be used. a lot of individuals don't require HEPA, but I do. I would like to be able to source my own filters from anywhere, and put them in. just like my current furnace. let people pick their level of air filtration they are comfortable with
How standard? The hardware store products are fundamentally pretty poor because they’re at most 2” deep. But Aprilaire, Lennox and some others have nice 4” filters at reasonable prices.
4" is standard. plenty on amazon and other places. hardware stores don't usually carry it because people probably don't understand that 4" is better from one side, and from the other not all filter boxes/supplies can accommodate > 1"
