I use a stoker with a 25cfm fan on my offset stick burner and it works great. I took Donnie's advice and piped in my air from the bottom under the grate. Cooked a t a comp last weekend when i fired up the smoker at 4am it was about 35deg and before the meat went on at 5am the smoker was up over 350(i cook h&f). but it kept the temp between about 2 degrees on wither shelf the entire cook. By the way my firebox is 24x24. here are a couple of pics of how i have mine done.