Adjusting your machine to the proper height ensures that the Kirby will remove as much debris from your carpet as possible. Setting it at the proper height maximizes airflow and allows the brush roll to gently, yet effectively agitate your carpeting. Raise the Power nozzle to the highest setting and turn the Kirby on. Then lower the foot pedal one level at a time until you hear a change in the sound of the motor. Lower the Power Nozzle one more level and your Kirby is now at the proper height for your carpeting.