The Clipsal Expressaire exhaust fan has automatically retracting fan blades which provide superior performance over similar size exhaust fans. While the fan is switched off, the blades are closed to shut out insects and prevent back draft. When switched on, they open quickly and silently by centrifugal force. The Mistral Expressaire is a non-ductable ceiling exhaust fan with a very high capacity (airflow).
A lead and plug is included with this model making for an easier installation. If you want it hardwired, you will need to get an electrician to do your installation.