Model 4/72Centrifugal Ventilator may be used for the indoor ventilation in ordinaryfactory or
in large-scale building .
B4/72 Conveys air other gas which may not selfignite,do no harm to human body or is not
corrosive to the steels.
Model B4/72 Centrifugal Ventilator may be used for the ventilation of gas which is flammable
and volatile.No glutinous matter is allowed in the gas.The dust or grain matter is no more
than 150mg/m³.The gas temperature is no more than 80℃
in large-scale building .
B4/72 Conveys air other gas which may not selfignite,do no harm to human body or is not
corrosive to the steels.
Model B4/72 Centrifugal Ventilator may be used for the ventilation of gas which is flammable
and volatile.No glutinous matter is allowed in the gas.The dust or grain matter is no more
than 150mg/m³.The gas temperature is no more than 80℃