Odatda uchta turdagi tashqi eshik yong’inga qarshi ko’rsatkichlari mavjud, ular A sinfi, B sinfi va C sinfidir. A sinfidagi yong’inga qarshi eshiklarning yong’inga chidamliligi vaqti 1.5 soatdan kam emas, B sinfidagi yong’inga chidamlilik vaqti emas. 1 soatdan kam va C sinfidagi yong’inga qarshi eshiklarning yong’inga chidamliligi 0.5 soatdan kam emas.

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