The oven's fermentation function usually has a dedicated button or logo on the oven's panel that is used to activate or select this function. This button or symbol is usually a small cup with a small colon in it, and this colon stands for fermentation.

The leavening function of the oven is mainly used to leaven the dough, which allows the dough to fully ferment at the right temperature and humidity for a fluffier, more flavorful pastry. Meanwhile, the fermentation function can also be used to make yogurt, rice wine and other foods that require microorganisms to participate in fermentation.