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Regardless of the blade type fan noise is roughly proportional to the pressure developed. 2°C) and four 250hp axi­vane fans with variable speed drives push the air through each cooler at Rodeo and Meikle respectively.  Thus the mine ventilation system in these areas is very large and complicated to manage.  Meikle—Griffin—Rodeo ventilation and escapeway plan.  54″ –150hp fan installed in a shotcrete bulkhead.  Installation of a booster fan on plate above a vent raise.  Two 48″ –150hp vent raise booster fans (in parallel) serving as auxiliary fans, steel ducting to be attached to the fans for heading ventilation.

Fan located at each end. 4kW of electrical power.  Electrical power requirements.  Total pressure of all fans.  Class D (poor) is omitted in this table. Actually, classes B, C, and D should not be considered for this type of duty because the demand for power is extremely high and impractical.  When there is a fan at each end of a column the power required to remove or deliver 10m3/s increases by less than a half. Table 2 illustrates that the S­type duct requires approximately twice, A­duct three times, B­duct six times, and C­duct twenty times as much pressure as a pipe.

Simulation does not provide an answer to the question, why oscillations extinguished.  Those results encourage to perform the detailed analysis and further research leading to identification of mechanism of this phenomenon which, when left without control, may even cause damage of the system’s main fan.  Propagation of pressure waves in accordance with a model of one­dimensional, compressible flow.  Pressure waves are being reflected off such obstacles as crossings and the air stoppings.  11. Bystroń(1973) Analytical Method for Investigating of the Stability of Operation of Main Fans in Mine Ventilation Networks Considered as System of Lumped Parameters.

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