An induced draft mechanical draft tower is a draw-through arrangement, where a fan located at the discharge end pulls air through tower. The fan induces hot moist air out the discharge. This produces low entering and high exiting air velocities, reducing the possibility of recirculation in which discharged air flows back into the air intake. When compared to forced draft cooling towers, induced draft towers have following advantages
1. Recirculation tendency is less a problem. The air that is thrown out from the top of the Cooling Tower has no chance of getting back into the Cooling Tower. The push of the fan adds to the upward thrust of the warm air.
2. The induced draught can be square as well as round. The distribution system is that of a sprinkler which is considered to be the most efficient water distribution system.
3. Noise level is very low, because the fan and motor are placed on the top of the Cooling Tower. They are not in level with the observer
4. A forced draft Cooling Tower cannot be a Cross-flow type model. An induced draught can be either Cross-flow or Counter-flow.
5. The parts of this type of cooling tower are easily accessible and there is no problem in their maintenance.