A small hole in the center of barrel cover, about 12 mm in diameter, vents the evolving offgases to an afterburner positioned above the barrel. Depending again on the moisture content of the feedstock, a small support flame may be needed to keep the gases ignited. A generous supply of air to the afterburner is key. A squirrel cage blower mounted so that it injects a tangential stream of air into the top of the afterburner would be ideal, as well as a stainless steel mesh or firebrick plate positioned about 3/4 of the way up the afterburner barrel to deflect the gas stream so it mixes well with the air and keep it ignited. However, a simple afterburner without the blower works relatively well.