![]() ![]() ![]() AHU Fan Selection In air handling units, centrifugal fans are used to circulate the air to the various parts of the sections in the building. The selection of the fan will depend on the air volume and the static pressure required of the system. In this case, the section after the fan has positive pressure. In the Blow-Through type, the fan blows the air through the mixing box, filters and cooling coil before discharging them to the space being conditioned or the ducting system. In this case, the section before the fan has negative pressure. The design can be vertical or horizontal. In the Draw-Through type, the fan pulls the air through the mixing box, filters and cooling coil before discharging it from the fan outlet to the space to be conditioned or to the ducting network.
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