This smaller low profile wind-powered rotary roof ventilator for vans provides ventilation for vans, buses, dog vans, horse boxes, ambulances, 4x4s, boats etc. This small van roof vent has been designed to protrude a maximum of 59.5mm above the vehicle's roof and low enough to fit under most roof mounted carrying racks, the 8 vaned air vent rotates freely while the vehicle is in motion drawing out stale air. This rotating van roof vent is the perfect solution for ventilating your van or trailer.