With the introduction of the Mark 3 Standard Range motor back in 2010, the installation of the airflow shutter has changed.
In years past, you could install the Airflow shutter over the pre-installed motor, however due to the design of the Mark 3 motor, you must first remove the motor to fit the shutter assembly.
Please click on the link below for a step-by-step guide on installation of the Standard Range shutter assembly in the Window Fan.