Commercial countertop convection ovens utilize a convection fan that blows air around the cooking cavity. This reduces cooking time since cold air is stripped off of the food surface by the moving hot air. When searching for an oven, consider the overall dimensions, electrical requirements and pan capacity. The overall dimensions of the countertop convection oven will indicate how much countertop space is needed to accommodate the unit. Each model is able to hold a certain number of half-size (13” x 18”) pans. You will want to take this amount into consideration when planning your menu, so you know the unit will keep up with your specific cooking capacity needs. Since countertop convection ovens are a little more powerful than other countertop implements, you will want to check the electrical specifications of each model to make sure it is compatible with your current electrical hookup. The units usually come prewired with a standard voltage and phase, but additional configurations are available on some models.