Two major forces are generated by a solid object traveling at highway speed displacing the mass of air in its path . . . Pressure and Vacuum. Pressure can be reduced by improving the object's shape however, Vacuum causes unintended consequences, all of them detrimental !

 

The most obvious force generated by a vacuum is a “suction action” which, at highway speed, is strong enough to lift up road spray, dirt, exhaust fumes, etc. placing them onto the truck cab, behind it and behind any Air Fairing.  On trucks with roof vents, contaminants will infiltrate into the cab causing discomfort to the occupants.

 

These contaminants will adhere onto the painted surfaces of the truck cab.  New paints are adversely affected by any acidy road spray such as Calcium & Magnesium Chloride, used during the winter, “sucked up” from the road and deposited on top and the rear painted and exposed surfaces of the truck.  The air filter inlet, mounted behind the truck cab, will also “inhale” those contaminants reducing its expected service life dramatically.  Any velocity generated “self-cleaning” is eliminated therefore moist contaminants will continue their corrosive process regardless if the truck is moving or standing still -TruckAid LLC’s Air Deflectors are engineered to offset (defuse) any vacuum behind their frontal surface with a  “Ram Air Effect” !

 

IN SUMMARY : TruckAid LLC's "Airglide" brand air deflector's unique and proven function is based on the "Ram Air Effect" produced by any vehicle speeding into the wind, allowing a portion of the air impacted to rush underneath the unit, through a specific gap between the deflector and the truck/tractor roof into the gap behind; this air flow is of high velocity (approx. hurricane category #1 velocity - because of the speed of the vehicle) but changes to become a low velocity pressurized air mass because of the “back pressure” created by the front wall of the van body or trailer.  This pressurized zone will re-generate itself as long as the vehicle is in motion and since this pressurized zone is stronger than the atomized road spray in the vicinity, it will resist the dirt particles trying to enter thereby eliminating a great percentage of dirty  deposits, and will assist heat to dissipate - providing a continuing (pressurized) air flow which any "trapped heat" can follow . . . TruckAid LLC's "Aero Aids" also provide an excellent surface to exhibit any company logo in addition to SAVING FUEL - Up to 15.6% depending upon truck size !