Yong’in eshigi yong’inga qarshi eshikni yopuvchi yoki odatda ochiq yong’in eshigi yong’in sodir bo’lganda eshik bargini avtomatik ravishda yopish imkonini beradigan eshikni yopish moslamasi bilan jihozlangan bo’lishi kerak (maxsus qismlarda, masalan, quvur mili eshigi, va boshqalar.).

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