... ,centrifugal ventilatorIntroduction of centrifugal ventilator,centrifugal fan,fan,ventilator, blower,air blower,exhaust fan,ventilation fanFRP is a new-type ... They are divided to dextrorotation and levoduction two kinds.From one electrical machinery end to look, we call ... direction of the electrical machinery , prevent the impeller from overturning.6. when turning round,must prevent sucking the ...