Lifts the smoke to the airstream coming from the nearby lake and over our roof. Without it most of the smoke stays in the back yard smelling up the house. Also helps to create a draft inside the smoker so it won't suffocate itself so easily. It's a bit of a princess demanding constant attention and adjusting the airvent so it smokes but doesn't burn or go out. Works surprisingly well. It's just a slip-on so when not in use I lift it off.
Ain't bad.

Ain't bad.