The Kreitler Killer Kool Headwind Fan is an adjustable resistance unit that runs off a belt coming from the front drum of your Kreitler Rollers. The first function of the Headwind Fan adds resistance with an adjustable air inlet that controls the amount of resistance desired. When closed, the additional resistance is minimal, and while wide open the resistance is high enough for even the strongest riders. The second function is to provide a cooling breeze with the Fan Unit. The fan can be rotated to point the airflow high or low and adjustable louvers can fine tune the side-to-side direction. Staying cool will make your workouts more enjoyable and is less stress on your body. The Fan attaches to the front left side of the frame, and you can also direct the airflow away from you if desired.