The number of racks required for an oven to work correctly can vary depending on the specific oven model and its intended use. However, most standard-sized household ovens typically come with two to three racks. These racks are designed to be adjustable, allowing you to position them at different heights within the oven to accommodate various cooking needs.
Having multiple racks can be useful when you want to cook multiple dishes simultaneously or when you need to use different cooking temperatures for different items. The racks allow for better airflow and heat distribution within the oven, ensuring that all the dishes cook evenly.
It's important to consult the user manual or specifications of your specific oven model to determine the recommended number of racks and their proper placement for optimal performance.