I'm just going to make my own, I think. After I get the filter in, I will seal it off with a piece of aluminum foil tape. (They say that duct tape isn't really good for ducts, and to use that foil tape instead.) It makes sense to me to seal it back up so that it's pulling only fresh air from outside. The recirc button is what you use if you don't want outside air.Went to Lowe's big box store. Looked at all furnace filters. Selected the following:
Filtrete Ultra Allergen 10 X 20 X 1
-Cut the length to 8" using heavy shop scissors.
This yielded a piece with actual dimensions of:
9 3/4 wide
Nice snug fit side-to-side and top to bottom.
Turned blower on, worked great and I could smell the fresh filtered air!
No G6 (that I know of) came from factory with a cabin air filter