NACA ducts were originally designed by NASA as a very low drag air-intake. When properly installed they allow air to be drawn in through vehicle body panels with minimal disturbance to the air flow. NACA ducts are usually used to provide air for engine, brake and cabin cooling and are commonly installed in bonnets and side panels for this purpose. All our NACA Ducts are designed to the an official NACA specification and is therefore guaranteed to match the performance characteristics of that duct design.