... b)Significant in preventing the spread of fire c)Act as a barrier to noise steel security doorfeatures:1) Material: cold-rolled ... x 900mme) 2,050 x 960mmf) 1,970 x 960mm3) Door panel thickness: 50mm ~ 70mm4) Opening direction: inward / outward5) Lock handle ... , Baisha CunDong street , HuangQi Town , Nanhai District ,Foshan City, China Steel security door(027)