Controller for exhaust system of calculation and control of the central hub, as the core of the system of electronic components, its performance directly affects the stability of the whole system and the superiority. Tongan ( TONANN ) since its inception, has always been to the controller and the system structure of R & D for the first task, the development of A, B, C three series of fume hood controller, respectively, realizing polymorphism level exhaust, air exhaust and intelligent environment monitoring, meet the entry level and in the high-end demand. Tongan ( TONANN ) is committed to the inside of the controller algorithm and structure optimization, the ventilation cabinet for maximum performance; Tongan ( TONANN ) constantly introducing the most advanced display and input technology, to provide users with the perfect man-machine interface