The classification of exhaust fans and the way of air change

Exhaust fans are divided into partition wall type (free space on both sides of the partition wall hole, ventilation from one side of the partition wall to the other side) and duct exhaust type (one side enters the air from the free space, The other side is exhausted through a duct), ducted air inlet type (one side enters the air through the duct, and the other side exhausts the air into the free space), full duct type (the exhaust fan is equipped with ducts on both sides, and the air enters and exhausts through the ducts. wind). According to the form of wind flow, it is divided into centrifugal type (air wind enters in a direction parallel to the axis of rotation, and exhausts perpendicular to the axis), axial flow type (air wind enters in a direction parallel to the axis of rotation, and still discharges in a direction parallel to the axis) And cross-flow type (air entering and exhausting are perpendicular to the direction of the axis).china centrifugal fan suppliers

There are three ways of ventilation of the exhaust fan: exhaust type, suction type, and combined type. The exhaust type enters the air from the natural air inlet and exhausts the dirty air through the exhaust fan; the suction type draws in fresh air through the ventilating fan, and exhausts the dirty air from the natural exhaust port; and the parallel type uses the ventilating fan to complete both suction and exhaust.