Yong’in eshigi va eshik ramkasi orasidagi qoplama 10 mm dan kam bo’lmasligi kerak va eshik va eshik ramkasi orasidagi bo’shliq 4 mm dan oshmasligi kerak. Yong’in eshigi o’rnatilgandan va yopilgandan so’ng, bo’shliq juda katta bo’lmasligi kerak, aks holda yong’in eshigining muhrlanishini kafolatlash qiyin va yong’in sharoitida yong’in va tutun tarqalishini bostirish funktsiyasini aks ettirish qiyin.

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