Installed new 14/2 NM cable from the switch box to the ceiling location for a customer-supplied bathroom exhaust fan. Mounted a single-pole switch on an existing circuit and verified load compatibility. Routed insulated 4" duct through attic space and properly terminated to an exterior vent hood with backdraft damper. All wiring secured per NEC guidelines, and fan vented to the outside to meet moisture control and code compliance standards. Proper ventilation prevents humidity damage and mold growth.