Below is a list of Portable Oven manufacturers from Illinois. Portable ovens are moveable thermal processing machines. They function in the same way as many other kind of industrial ovens, but are generally limited in capacity because of their small size. Portable ovens in industrial contexts tend to be limited to uses within the food service and production industries. In manufacturing contexts, there are few reasons why an oven would need to be portable as the production lines that would feed the ovens are almost exclusively stationary.