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Heat Transfer 257
Figure 10-181. Typical drive arrangements for air-coolers. (Used by permission: Griscom-Russell/Ecolaire Corporation.)
Fan guards of wire grating or hardware cloth are ever, a close fan guard, Figure 10-182, will prevent blade con-
mounted below the fan to prevent accidental contact with tact by the operators.
the moving blades and to keep newspapers, leaves, and Tubes, Figure 10-183A and 10-183B, are usually finned
other light objects from being drawn into the fan. The use of with copper, aluminum, steel, or a duplex combination of
a wire fence around the entire unit is good to keep unau- steel inside with copper or aluminum fins outside. Other
thorized individuals away from all of the equipment; how- combinations are used to suit the service with the ratio of