Are you referring to the stack gizmo? So it makes little effect having the exhaust at grate level? You always see the claim it draws the smoke down near the grate level and keep heat in the top of the chamber to help maintain the cook temp. You read a lot of different claims though so I wouldn't be surprised if it didn't have as much benefit as claimed. Lang smokers take it out the top but I couldn't see a clear picture whether it was extended down into the cook chamber or not.Gizmo wrote:Direct out the top will work just fine