A sinfidagi yong’inga chidamli eshiklarning yong’inga chidamliligi 90 minutdan kam emas, temir va yog’och ham bor. A sinfidagi yong’inga qarshi eshiklarning ichki qismi odatda perlitdan va oz miqdorda o’tga chidamli materiallardan, masalan, vermikulit yong’inga chidamli plitalardan, ko’pikli eshik yadroli plitalardan, MC moslashuvchan materiallardan va boshqalardan iborat.

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