Chelik yong’inga qarshi eshiklar quyidagi uch turga bo’linadi: A sinfidagi temir yong’inga qarshi eshiklarning yong’inga chidamliligi 1.5 soatdan kam bo’lmasligi kerak; B sinfidagi temir yong’inga qarshi eshiklarning yong’inga chidamliligi vaqti 1.0 soatdan kam bo’lmasligi kerak; C sinfidagi po’latdan yasalgan yong’inga qarshi eshiklarning yong’inga chidamliligi vaqti 1.0 soatdan kam bo’lmasligi kerak. 0.5 soatdan kam.

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