In most microwave ovens, the exhaust fan and the oven share the same power supply and are interconnected. The reason for this design is primarily related to safety and functionality.
Microwave ovens generate heat during operation, and the exhaust fan plays a crucial role in dissipating that heat and keeping the components cool. If the exhaust fan were to be turned off while the oven is running, it could lead to an overheating of the internal components, potentially causing damage or even posing a fire hazard.
By keeping the exhaust fan running during operation, the microwave oven ensures proper ventilation and heat dissipation, which helps maintain safe operating temperatures. The fan helps to remove excess heat, steam, and cooking odors from the microwave cavity, preventing the accumulation of moisture and improving the overall cooking performance.
While it may seem inconvenient not to be able to turn off the exhaust fan, it is an intentional design feature to ensure the safe and efficient operation of the microwave oven. Manufacturers prioritize safety and functionality in their designs to prevent potential hazards and ensure optimal performance.