Air defense projects protective closed doors and closed the door from the appearance of what is the difference? In fact, air defense projects protective closed doors and closed doors is not much difference between the air defense door manufacturer, but different thickness, the thickness of the protective closed doors about 20 centimeters high quality air defense door, closed the door thickness of about 18 centimeters, the other no difference. If in doubt air defense air defense door doors attentive service, please call Henan Sheng-chun, air defense equipment Limited, the business manager Zhou Ming enthusiasm to answer your questions! Production varieties range air defense projects implemented protective equipment products sentinel species include: reinforced concrete steel protective doors protective doors protective doors electronically controlled valve hose protective doors closed doors reinforced concrete protection of reinforced concrete structures live-mounted steel door sill protective airtight protective single fan Steel double-leaf door closed airtight protective steel live-mounted door sill guard closed the door landing single fan guard closed the door after landing double fan guard closed the door sill-mounted protective guard closed doors closed valve closed doors closed doors electronically controlled protection of reinforced concrete structures live-mounted single-leaf steel door sill sealed airtight steel double-leaf door closed steel door sill alive mounted single fan landing closed doors closed doors closed doors landed dual fan air intake and exhaust secret behind closed doors closed doors electronically controlled live-mounted threshold electric control valve closed doors hose hanging pendulum wave explosion-proof wave explosion overpressure valve exhaust valve closed valve reinforced concrete protective cover sealed airtight closure observation windows sealed bezel cover other special protective equipment products in Henan Jin Sheng air defense Equipment Co. production of various types of civil air defense doors, Baidu search for "air defense Equipment Co., Henan Sheng-chun," visible company website and contact information. Air defense doors caring service, civil defense doors, high-speed train station in Zhengzhou City, air defense doors supplied by Tianjin Jin Sheng Sheng provided by the Civil Air Defense Equipment Co., Ltd., Henan. 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!