Hi,
The reason for fans working better "Sucking" rather than "Blowing" is mainly due to presure differential & stagnant airflow. High pressure heats air and also introduces heat from the fan, low pressure cools it. Also "Sucking" creates better airflow due to less dead spots.
However a combination of fans could improve efficiancy by blowing directly on hot spots as long as cfm "cubic feet per minuet" blowing is less than cfm sucking.
Chris
