An air inerting system for supplying nitrogen-enriched air to a fuel tank on a vehicle includes an air separation module. The air separation module has an inlet for receiving air to separate oxygen, and an outlet for delivering nitrogen-enriched air to a downstream fuel tank on a vehicle. Downstream parallel flow lines of the outlet are each provided with a flow control valve. The downstream parallel flow lines reconnect downstream of the flow control valves to provide a source of nitrogen-enriched air to the fuel tank. An air supply line upstream of the air separation module supplies air to at least a pair of upstream parallel lines. Each of the upstream parallel lines are provided with a shut-off valve. The upstream parallel lines reconnect downstream of the shut-off valves to supply air to a heat exchanger. Air downstream of the heat exchanger passes to the air separation module.