To provide a fan selection device capable of selecting a fan using a small
amount data prepared in advance and also using simple computations. A
required ventilation flow quantity is computed by computing means 4 when
predicted total electric power consumption and a predicted air
temperature rise are entered into a predetermined computational
expression. Parameter range determining means 5 determines a parameter
range of a proper flow quantity ratio necessary for cooling. Required
flow quantity computing means 7 computes a minimum required flow quantity
and a maximum required flow quantity by dividing the required ventilation
flow quantity by the upper and lower limit values of the parameter range
of the proper flow quantity ratio, respectively. Selection means 8
searches for a fan that produces the maximum flow quantity necessary for
obtaining a flow quantity that falls between the minimum required flow
quantity and the maximum required flow quantity, from a database 9, and
selects the fan as the required fan.