It is even more necessary to install deflector covers on box vans

It is well known that the body of a box truck is higher than the cab, with a height difference and a certain gap, which makes the overall shape of the vehicle discontinuous and has poor fluidity. When a box truck is running at high speed, the airflow above the cab encounters the upper part of the front of the closed compartment, causing a large stripping from the front edge of the compartment roof, and the air resistance coefficient value increases as a result.

If a deflector device is installed on the top cover of the cab to create a streamlined transition between the cab and the cargo box, it can guide the airflow flowing over the upper part of the cab to "connect" with the upper surface of the box body, allowing the airflow to flow very close to the surface of the closed cargo box top cover, thereby reducing the air resistance coefficient. Therefore, it is even more necessary to install a deflector cover on a box truck.

With the development of the national economy, closed box trucks have received policy support. Multi-axle vehicles and car trains are encouraged by the state. The production capacity of these types of vehicles is bound to develop rapidly. Facing the pressure of tight oil resources and rising oil prices, reducing fuel consumption has become an important factor for users when choosing a car and for manufacturers when making vehicles. These factors will create greater space for the development of the deflector.