An electronic enclosure includes a chassis with a fan base and a fan module. The fan base and fan module are disposed so that the fan module may installed in the fan base in a first configuration to provide front-to-rear air flow within the enclosure, or the fan module may be detached from the fan base, turned and reinserted into the fan base in a second configuration to provide rear-to-front air flow within the enclosure. The fan base is provided with two power connectors, one of which mates with the fan module in the first configuration and the second one of which mates with the fan module in the second configuration.