Spraydown own a number of patent, patent applications and design applications relating to its Air Water Separator Spray Suppression Mudflap.

The mudflap comprises of a panel formed from series of vertical vanes in a side by side, overlapping relationship as shown below. These vanes form a number of passages running from front to back, with each passage having one or more changes of direction and a number of water-collecting pocket formed by the vane.

The mudflap operates by allowing the vehicle spray (comprising air and water) entering these vertical passages formed by the vanes. The vehicle spray is made to change direction on more than one occasion by virtue of the shape and profile of the vertical baffles. This change in direction and resultant inertia effects result in the water, being heavier than air, tending to continue to move in a generally straight line until it meets a wall of the vane and subsequent pocket whilst the air component of the spray will readily change direction and continue through the passage. Some water will escape a first pocket but will tend to be caught by the next pockets provided at other changes of direction in the passage. When caught in a pocket, the water runs down the pocket and is deposited directly on to the road. The air component, however, passes through the passages of the panel to exit at the rear side of the panel.