Everything Sauzo said. For a female boa, if you are wanting to get a cage that will work for her life, then I'd go with something a little bigger than their 4'x2' footprint cages. I'd go with at least a T13 (4'x30"x 18"). A T25 would give you even more assurance that it would be large enough for her as a fully grown adult.
I use T10 and T11 for my boas, but all of mine are males that will typically stay smaller than females will. I get the sliding glass doors with locks, the basking shelves, heat tape, and the recessed LED lighting (that one isn't on the website, you have to call and ask).
I have been extremely happy with my AP cages they are very well made.. Just be prepared to wait the ~3-4 months it will take for it to be built.
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