WHAT IT IS The revolutionary design of the Heat Boss Vent Brush allows you to control the airflow when drying styling hair with a simple click of the Heat Force Switch. WHAT IT DOES Leave the vent fully open allowing hair to fully pass through the chrome plated Lux Tunnel. Halfway dry hair Half way close the vent to focus on shaping. Dry Hair The Cricket Heat Boss Vent Brush does care Shut the vent and polish off the style your way.