Ventilation Equipment Co., Ltd. Shanghai Wai fans gather useful life of more than two decades, providing an unconditional warranty for two years. Not have to do after-sales service after-sales service is the best after-sales service. Our goal is to make China the best suction fan, fans gather in Shanghai four years of benefits without a maintenance record, our goal is not bad a decade. Hui together to focus on plant ventilation cooling technology R & D and innovation. Because of your support so we will do better tomorrow.