Originally Posted by semtex

I've been thinking about this some more. The only potential downside to bringing in air from the fangs is that it might soak up heat from asphalt. That's why they don't design these things to draw air from low to the ground to begin with -- at a certain point you'll draw in heat rising from the surface and that'd be counter-productive. This is where R&D comes into play to figure out if the fang openings are too low to the ground.