In this type, the tube bundle is located on the suction side of the fan.  Virtually one can see the fan is located above the tube bundle.
Advantages
•    A better air distribution across tube bundles
•    Less possibility of hot effluent air recirculating to inlet, the velocity of hot effluent air is higher than inlet air velocity (approximately 2.5 times)
•    Less fouling, the plenum covers 60% of bundle surface area and prevents from sun, rain and dirt
•    High natural draft capability on fan failure
Disadvantages
•    Possibly more power requirement if effluent air is very hot
•    Limitation of effluent air to prevent fan failure
•    Less accessible for fan maintenance and bundle replacement
•    Maintenance may have to be done in hot effluent air caused by natural convection