. Induced Draft Counter flow
- Most common industrial/commercial type.
- Fan at top pulls air upward.
- Square/rectangular (factory-assembled) or round (package towers).
2. Forced Draft Counter flow
- Fan at bottom pushes air upward.
- Less common due to airflow distribution challenges.
3. Factory-Assembled Package Towers
- Small to medium capacities (50-500 tons).
- Usually round with centrifugal fan at top.
4. Field-Erected Counter flow
- Large capacities for power/process industries.
- Concrete or FRP construction.