Turn off power to the bathroom fan at the circuit breaker
Verify the power is off with a non-contact voltage tester
Remove the fan cover
Remove the fan housing screws or mounting hardware
Disconnect the wiring from the old fan
Disconnect the duct from the fan housing
Remove the old fan from the ceiling
Compare the new fan to the old one for size and duct location
Install any necessary mounting brackets or support
Connect the duct to the new fan housing
Connect the wiring to the new fan
Secure the new fan housing to the ceiling framing
Install the fan motor and grille
Restore power at the breaker
Test the fan operation and airflow
Check for unusual noise, vibration, or loose connections