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Oddiy eshiklarning funktsiyalaridan tashqari, UL yong’inga qarshi eshiklari ham olov va tutun tarqalishini oldini oladi. Ular ma’lum vaqt ichida yong’in tarqalishining oldini olish va odamlarni evakuatsiya qilishni ta’minlashi mumkin. UL yong’inga qarshi eshik – yong’in bo’linmasi, evakuatsiya zinapoyasi, vertikal mil va boshqalarda o’rnatiladigan ma’lum yong’inga chidamliligiga ega yong’in bo’linmasi.

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