Single-leaf steel door air defense protection closed doors GFM0820 (6) GFM0820 (5) What is the difference? In a nutshell is what the data in parentheses represent? The number in parentheses indicates that the air defense gate resistance levels. A high level of air defense door can be used for low level air defense projects, low-level air defense door is not available for a high level of civil air defense projects. Henan Jin Sheng air defense Equipment Co. issued strict accordance with national standards and drawings organize production, strengthening the process of managing the production process, strict inspection system and quality control records. When the factory, must be installed according to the certificate and manual door HM air defense, and at the specified location marker manufacturer name and number. Jin Sheng Equipment Co., Ltd., Henan air defense system established product files HM1020 air defense doors, do users pay a return visit to work, improve service, and report regularly to the production and operation of the province, autonomous region and municipality civil defense office. Henan Province Civil Air Defense Office of Civil Defense designated door manufacturer. Can Baidu "Henan Jin Sheng air defense Equipment Co." check our website and contact information. HM door air defense, air defense doors, Henan Jin Sheng air defense doors superior quality provided by Henan Sheng-chun, air defense equipment Limited. Henan Jin Sheng air defense equipment Limited (www.jsrenfang.com/) strong, credible, in Zhumadian other industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Jin Sheng air defense and you hand into the brilliant, for a better future!