Yong’in eshiklarining yong’inga chidamliligi yarim soatdan uch soatgacha. A sinfidagi eng asosiy yong’inga qarshi eshiklarning yong’inga chidamliligi vaqti 1.5 soatdan kam bo’lmasligi kerak; B sinfidagi yong’inga qarshi eshiklarning yong’inga chidamliligi vaqti 1.0 soatdan kam bo’lmasligi kerak; C sinfidagi yong’inga qarshi eshiklarning yong’inga chidamliligi vaqti 0.5 soatdan kam bo’lmasligi kerak. Iltimos, yong’inga chidamliligi uzoqroq bo’lgan yong’in eshiklari uchun biz bilan maslahatlashing.

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