A scaleable indirect evaporative cooler system (10) fitted within a container incorporates a plurality of dry and wet passage heat exchangers (30) where the dry passages of the plurality of heat exchangers feed into a common space (32) from which conditioned air is delivered via a delivery fan (40) downstream of the dry passages of the heat exchangers. An exhaust fan 22 draws air from the common space (32) through the wet passages of the heat exchanger to a common exhaust space (34) before being exhausted to atmosphere via the exhaust fan (22).
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