A: No, the AW2020E model will need a 4" air kit. The item number is 4FAK.
A: No, this kit includes a 2" diameter pipe. The VG2520 requires a 4" diameter pipe.
A: It is foil but its bigger than the pipe that pass's threw so there is a air barrier there. the pipe that pass'e threw does not get very hot.
A: The vent sections included with this kit are made of flexible aluminum. They are 2" in diameter and could be connected to any 2" intake connection.
A: Yes, the pipe is 2" in diameter.
A: Yes 2" I installed mine through the wall right behind the stove. 2" pipe is flexible.