(57) An economical and efficient air conditioning system for Supplying clean air to equipment,
such as a main frame comPuter, comprises a row of units (10, 11, 12) arranged side
by side. Each unit (1) has an impeller (14) which draws air in hrough a filter (15)
and forces it through cooling means (16) o underfloor ducts which supply the equipment.
Temperature sensors, e.g. under the floor, control the impeller speed and the cooling
means temperature so that the equipment temperature s maintained in the narrow range
required for optimum func- ioning. If one unit should fail or be shut down for servicing
the adjacent units can provide temporary back-up by opening of tampers (23) at each
side of the affected unit and increased mpeller speed in the remaining units.
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