求翻译：点火前必须首先打开烟道挡板和灰门自然通风10~15分钟，采用机械通风时，应先开引风机再开鼓风机，以免使炉膛内的粉尘受外界风压引起飞扬伤人。是什么意思？

Must first open the flue baffle and ash doors natural ventilation for 10 to 15 minutes before ignition, mechanical ventilation should be open lead fans to open the blower so as to prevent dust in the furnace by the external pressure caused by flying wounding.

Pre-ignition must first open flue damper and gray doors, natural ventilation 10 ~ 15 minutes using mechanical ventilation, it should first the wind machine will open up in the furnace blower in order to avoid the dust caused by the external 54~880AEROS wounding.

Before the ignition must first turn on the damper and the ash gate natural ventilation 10~15 minutes, when uses artificial draft, should operate the drawing fan to operate the air blower again first, in order to avoid causes in the chamber the dust to cause the outside wind pressure flies upwards of

You must first open the flue damper before ignition and ash door 10-15 minutes of natural ventilation, when mechanical ventilation should be open to open blower fan, so as to avoid flying dust from outside air pressure in the furnace causing injuries.