Since 2004, Zhengzhou Dema Electric Co., Ltd,we are a professional company engages in low voltage electrical products for one-stop electrical accessory services,such as ventilation fan filter,axial flow fans,centrifugal fan,heater，thermostat, terminal blocks, wiring terminals, cabinet accessories, electronic products，etc. Through our 20+ years efforts and development,demma products are exported to many countries globally, well-known with good reputation in the market for the sake of our sustainable quality and competitive prices, kind and prompt services.