First, we preheat the roasting chamber to 420F. The fan is on a lower setting with heat gradually increasing every minute or so. Once this is reached, we pour our desired amount of green beans into the chamber (we typically roast in 2 to 3lb batches). Then, we turn up the air flow so that the beans are producing somewhat of a fountain effect (called loft) and have the heat at the highest setting if using the maximum amount of beans for the chamber.Now comes the waiting and watching. The fir …