If you open a Lasko box fan and look at the switch, here is the standard pinout (viewed from the back of the switch):
(e.g., Lasko 60846-02). Do not guess based on wire colors alone. If you must use a generic switch, ensure the "L" terminal receives the Black Hot wire only, and the White Neutral bypasses the switch entirely. Lasko Fan Wiring Diagram
If you can’t find the exact diagram, you can still diagnose common issues: If you open a Lasko box fan and
: Essential for providing the necessary torque to start the motor. Lasko Fan Wiring Diagram
While a specific model number is