AP cage sizes quick question

Real quick question and since I'm on here right now I'll ask you all.

AP cage sizes, are the dimensions on the website inside measurements?

From what I understand the measurements are exterior only. Inside dimensions are approximately 2 inches shorter. For example a T8 is listed as 12 high, but interior is actually 10 high. Doors I believe are 8 high.

Hopefully someone else can confirm. I'm going based on what other members have said about their cage dimensions.