Yong’inga qarshi panjur, 90 daqiqali yong’in eshigi, 3 soat nominal eshik

Po’latdan yong’inga qarshi eshiklar uchun fan va eshik ramkasi o’rtasidagi qoplama 10 mm dan kam bo’lmasligi kerak va fan va eshik ramkasi orasidagi ikki tomon orasidagi bo’shliq 4 mm dan oshmasligi kerak.

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