... We design, develop and supply many kinds offan speed and temperature controller for telecommunication, heat exchanger, HVAC, ... Adjustable from 25°C to 30°CFan Full-speed Temperature: Adjustable from 35°C to 40° ... Expectance: 50,000 hours Princple and use instruction of our 2 fans type fan controller for example ... controller according to your requirements. PWM Variable speed fan speed control themostat