B sinfidagi po’latdan yasalgan yong’inga qarshi eshikning yong’inga chidamliligi 1.0 soatdan kam bo’lmasligi kerak va yong’inga qarshi eshikda ishlatiladigan apparat aksessuarlari ham refrakter apparat aksessuarlaridan foydalanishi kerak. Odatda bu turdagi yong’in eshigi odatda oilaviy eshiklarni bezash uchun ishlatiladi.

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