Napoleon GZ550-1KT Blower Kit with Variable Speed and Thermostatic Control provides a fireplace component to help heat circulation. This GZ550-1KT Blower Kit is intended for use with select Napoleon fireplaces in order to increase heat circulation and energy efficiency. Universal blower kit includes the blower and temperature sensor to automatically control the blower when the fireplace heats up - also includes rheostat control for fan speed adjustment.