Yong’inga qarshi eshiklar odatda yopiq yong’inga qarshi eshiklarga va odatda ochiq yong’inga qarshi eshiklarga bo’linadi. Odatda yopiq yong’in eshigi eshik yaqinroq ta’sirida yopiladi; Shuning uchun, yong’in chiqqanda, yong’in tutunining tarqalishini oldini olish mumkin. Odatda ochiq olov eshigi eshikni yopish ta’sirida ochiq. Yong’in sodir bo’lganda, kalit faol ravishda chiqariladi va eshikni yopish va hizalama moslamasi ta’sirida yong’inga qarshi eshik yopiladi.

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