The fans and their drive are mounted on the top deck. Fig. 5 illustrates the actual components of a counterflow induced draft tower in greater detail. This type requires large electric motors due to the tortuous path that the air takes. Counterflow induced draft tower. A schematic drawing of another type of induced draft tower, called the crossflow is shown in Fig.
Crossflow towers provide horizontal air flow as the water falls through the packing.
Single and double air flow designs are constructed to suit the job location and operating conditions. Crossflow tower design. The fans, located at the top, draw air through cells or packing that are connected to a suction chamber partitioned midway beneath each fan. The water falls from the distribution system in a cascade of small drops over the packing and across the horizontal flow of air. The total travel path of the air is longer and there is less resistance to air flow than in the counterflow design.