The first thing to note about the "Sky Venture" tunnel in Chengdu, China is that the tunnel is not a wind tunnel manufactured by SkyVenture. The tunnel is a one of a kind design and built by the military and re-purposed for amusement use. The tunnel is located within the Happy Valley amusement park.
The tunnel does not feature an anti-chamber. There is a door that is closed when in use. The tunnel is also unique in the sense that you can both fly in a wall to wall indoor chamber as well as above in a wall-less outdoor chamber.