In the last post, we saw how Wayne Keith lights up in less than 5 minutes. Here's how he shuts down the gasifier when he gets to where he's going. All the incoming air is cut off to the unit, so combustion ceases. However the wood and hot char that is in there will stay lit for some time, allowing a quick restart for about 6 hours. Notice that no smoke escapes from Wayne's gasifier even when it's sitting still; he does not attract attention in the parking lot.