Although originally approved by the SCCA, they succumbed to pressure from other teams who argued that the fans constituted "movable aerodynamic devices". Sanctioning body FIA had banned such devices beginning with the 2E.
Although initially sanctioned by the SCCA, the teams eventually relented to criticism from rival teams, who contended that fans were essentially "mobile airflow regulators". In response, the FIA prohibited such devices starting with the 2E.