... fooled - despite the simple design, this full-power cooker works very well and is in no way "minimum" as far ... be larger all around, but it doesn't matter how much bigger, as long as there is a half ... inch (1.5cm) or more of an airspace between the two boxes. The distance between the two ... two layers tend to separate from each other to form an airspace as the oven cooks. When using this method, ...