Chillout Systems Transparent 4" NACA Air Intake Duct

• 4-inch transparent NACA air intake duct
• Provides 55% more airflow vs. standard 3-inch NACA ducts
• Wind tunnel tested for proven aerodynamic performance
• IMSA compliant for professional racing applications
• High-pressure injection molded for superior strength and clarity
• Retains shape at high speeds—no flex or deformation
• Designed for use with 4-inch ducting and plenums
• Lightweight yet heavy-duty construction
• Crystal-clear finish for a premium appearance

The Chillout Systems Transparent 4" NACA Air Intake Duct is engineered for racers who demand maximum airflow without compromising aerodynamic efficiency. Wind tunnel tested and IMSA compliant, this 4-inch NACA duct provides over 55% more airflow than standard 3-inch ducts when used with 4-inch ducting and plenums—making it ideal for high-performance cooling system setups.

Unlike common vacuum-formed NACA ducts that appear cloudy and can deform at speed, this version is manufactured using high-pressure injection molding. The result is an ultra-transparent, crystal-clear finish with significantly improved rigidity and durability. It retains its shape at high speeds, ensuring consistent airflow performance in demanding race environments.

NACA duct design is inherently aerodynamic, allowing air to enter the vehicle with minimal drag increase. Its narrow-to-expanded internal profile increases cross-sectional flow area gradually, reducing static pressure while maintaining boundary layer stability—maximizing intake efficiency without turbulence or added drag.

Lightweight yet heavy-duty, this 4" NACA duct is built for professional motorsports applications where cooling efficiency, aero integrity, and appearance all matter. For extreme heat conditions or high-demand cooling systems, stepping up to 4-inch ducting delivers measurable airflow gains.