Ko’pgina kvartiralarning yong’inga qarshi eshiklari B sinfidir, odatda yong’in o’tish joylari uchun ishlatiladi va yong’inga chidamlilik vaqti bir soat. B toifali po’latdan yasalgan yong’inga qarshi eshik ajoyib ovoz yalıtım ta’siriga ega. Uning yuzasi elektrostatik kukun bilan püskürtülür, shuning uchun uning yuzasi chiroyli va mustahkam bo’lib, yaxshi yong’inga chidamliligi, yaxlitligi va issiqlik izolatsiyasiga ega.

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