The Vantech Wind Foil installs onto the crossbar of a H1 or M Series rack system. While driving higher pressure air is pushed up from the vehicle and collides with the cross bar causing. This may cause the cross bar to shake or cause a whistling noise. One remedy is to move the front segment further back to prevent the higher density air to hit the cross bar. For vehicles with specific mounting points a wind foil can help diflect the wind away from the cross bar decreasing intensity of whistling.
Installed on the front bar to divert airflow away to reduce wind noise on cross bars.