Steel protective closed doors typically contain GM, GFM, GSM protective airtight door manufacturer, GHM, GSFM, GHFM, GHSM HM1020 protective closed doors, GHSFM, steel protective airtight door with flat open. Divided by the number of doors, there are two kinds of single-leaf door double-leaf doors and air defense air defense. (1) single-door generally used for smaller sized staff entrance. (2) the size of the double doors of the vehicle are generally used for entrance. Protective closed doors reinforced concrete regular size single fan guard closed doors 700 × 1600 800 × 1800 800 × 2000 900 × 2000 1000 × 2000 1200 × 2000 1300 × 2000 1500 × 2000 in peacetime, wartime usually have less access to the threshold applicable to staff The entrance of reinforced concrete protective barriers single fan living closed doors 800 × 2000 900 × 2000 1000 × 2000 1200 × 2000 1300 × 2000 1500 × 2000 usually no threshold, the threshold applies to peacetime wartime have personnel basement entrance double reinforced concrete fan guard closed doors 2000 × 2000 2500 × 2500 3000 × 2500 4000 × 2500 in peacetime, wartime has usually out of the threshold applicable to staff, fewer vehicle entrance guard closed the door price, Sanmenxia City protective closed doors, Jin Sheng protective closed doors Low prices 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!