Yong’in eshiklarida odatda kuzatuv oynalari deb ataladigan derazalarga ruxsat beriladi. Shu bilan birga, yong’in eshigidagi derazalar yong’inga qarshi oynadan yasalgan bo’lishi kerak, derazaning o’lchami, yong’in eshigi bilan birgalikda ishlov berish va ochilish va yopish oynalarining tuzilishi yong’inga qarshi tegishli qoidalarga qat’iy muvofiq bo’lishi kerak. Bo’lim.

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