Ping Ya Trade and Industry to teach you how to distinguish between security doors and steel doors: First, in the purchase of security doors, to the dealer's business qualification certification Fire Door much money, the Public Security Bureau to see whether the operator holds anti-technology management department issued a "security doors certification." Secondly, we must pay attention to double-check, a qualified security door plate thickness should be 2mm above the door frame, door thickness of 20mm or more, the weight of the door is generally more than 40kg. Ping Ya Ltd. Since operations to create a first-class service for business purposes, depending on the product quality as the source of life, promote green decoration materials manufacture, development is inseparable from Asahi US steel doors strong support of many partners into the fire doors wholesalers, we are constantly developing new steel entry door wooden products factory direct fire, keep the fire of its own advantages entry door in a highly competitive market, welcome new and old customers to our guest, and visit and negotiate business . Fire Door Suppliers, Trade and Industry recommended Ya Ping, Shanxi Fire Door Co., Ltd. Yongkang level provided by the Industry and Trade ya. Yongkang Ya Ping Ltd. (www.ykpygm.com/) Zhejiang Jinhua, doors leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Ya Trade and Industry leaders in the flat with the staff warmly welcome all inquiries negotiations to create flat Ya better future for industry and trade.