This product is designed YBT Bureau Ventilator, with explosion-proof certification and "MA" safety signs Zhunyongzheng, it also has the matching motor 2 certificate, are flameproof security products. Failure analysis and troubleshooting table. FBC Board Ventilator _ Explosion local fan (certified) _ Xilin Gol League Bureau Ventilator Co. provided by Zibo Blower. Zibo Blower Factory Co., Ltd. (www.zibo-fengji.com) is an industry leader in Shandong Zibo, fans, ventilation equipment, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Zibo Blower leadership with the staff warmly welcome all inquiries negotiations to create a better future Zibo Blower.