In this type, the tube bundle is located on the discharge side of the fan. Virtually one can see the fan is located below the tube bundle.
Advantages
- Easy access to maintenance for fans and bundles
- Accommodates higher process inlet temperatures
- Possibly less power requirement if effluent air is very hot
- Fans remain in cold ambient temperatures
Disadvantages
- Increase possibility of recirculating of hot effluent air resulting from low discharge velocity from the bundles, high velocity in inlet fan rings, and no stack.
- Less uniform velocity across tube bundles
- Completely exposed tube bundles to sun, rain and dirt resulting in poor process control and stability
Low natural draft capability on fan failure
