I am using a 2 A.H Li-Ion battery. Let antenna go out through holes on the bottom.
Then the SS box is good to hold all in. I monitor from my note book
But if you use a bigger Lead battery, this SS box is not big enough.
For your information, I just make a new arrangement.
Put controller, battery or AC/DC adapter, fan inside a plastic box, a 1"x 3' corrugated pipe connects box and smoker.
It is ready, I will take picture in 2 days