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Low ambient temperatures at Spa allowed teams to reduce the standard sidepad cooling vents in order to improve aero efficiency. Williams removed the gills (inset detail) normally located on the FW29s left sidepod, close to the inner face of the venting chimney. This solution improved airflow management towards the rear of the car, as the airflow was not disrupted by the turbulent, hot air that normally emerges from the gills.