Product introduction The most common ventilation seat ventilation products on the market, in the forms of five fans or seven fans. These fans are embedded inside the sponge for ventilation purpose. Comfortable ventilation system working principle The three speed PWM signal is generated by the single-chip microcomputer to control the fan speed. Product Parameter JIUYI brand Car seat ventilator including several ventilation blower with following specifications: Type: Three speed axial type fan 鈥?Application:car, van and truck 鈥?Working voltage:12V or 24V 鈥?Compact design for easy installation 鈥?Low noise 鈥?Minimum vibration Product details Seat fans and blowers are key parts of universal type seat cooler ventilation system. All ventilation fans are undergoing fatigue test more than 3,000hours. Three speed design(1800rpm/3200rpm/4600rpm) best meet the cooling requirements of car drivers and passenger. The system comes with an OEM type rocker switch that control all three settings:High, Med and Low. How many fans will be installed for my front seats? Five or seven fans for each seat, no matter for driver鈥檚 seat or passenger seat. A lot of car owners prefer 5 blower type, three be built in seat base cushion and two for seat back.Ventilated Car Seat Free Sample website:http://www.jiuyiseat.com/climate-controlled-seat/ventilated-car-seat/