Hi gang, I need a little help, I built my first smoker out of an old fridge. I have used a side burner from on old barbeque mounted underneath. Using air controls and chimney size changes, I have controlled the temp really well, but I am having trouble making the chips smoke?? The pan is essentially right over the flame. Chips don't catch fire or smoke, in fact after an hour over the flame, I can pick up the unburned chips in my hand. Any suggestions would be appreciated. Don't know if it matters, but there are air controls on both sides of the fridge down low. Thanks in advance, Mike.