What is the function of a wall fan switch and how does it control the operation of a wall fan?

A wall fan switch is used to turn a wall fan on or off. It controls the operation of the fan by completing or interrupting the electrical circuit that powers the fan motor. When the switch is turned on, it allows electricity to flow to the fan motor, causing it to spin and circulate air. Turning the switch off breaks the circuit, stopping the fan from running.