In addition to the objective factors mentioned above, there are other factors to consider to determine the optimal location and design of the crossflow fan:

1. Space limitations: The space limitations inside the oven will seriously affect the location and design of the crossflow fan. Ensure that the size and shape of the fan fit into the oven space and do not hinder the storage and cooking of food.

2. Food type and size: Small foods of different types and sizes are likely to have different cooking methods and airflow distribution. Consider the shape, size and placement of the food to determine the location and design of the crossflow fan to maximize the cooking requirements of the food.

3. Heating speed and uniformity: Some foods need to be heated quickly, while other foods must be heated more evenly. Adjust the fan position and design according to the customer's cooking requirements to achieve the required heating speed and uniformity.

4. Temperature control: The location and design of the crossflow fan will also seriously affect the temperature control of the oven. Ensure that the fan position does not interfere with the reading of the oven temperature sensor to ensure that the operation of the fan does not adversely affect the temperature distribution inside the oven.

5. Noise and vibration: Some crossflow fans may produce noise and vibration. Plan to place the fan in a position that can minimize the transmission of noise and vibration to the oven and the surrounding environment.

In general, determining the best location and design of the crossflow fan requires comprehensive consideration of multiple factors such as space limitations, food types and sizes, heating requirements, temperature control, and noise and vibration. Conduct experiments and observations based on actual conditions, and make adjustments and optimizations based on actual needs.