3D printed nylon ducts are light weight and easy to install.
These will only work with polycarbonate windows or metal surfaces but all you need is a holesaw for installation unlike a NACA duct. The body is threaded so you drill the hole, pop it in and tighten the nut down.
The 3" or 4" sizing refers to the diameter of the hose these attach to. We use them as inlets for helmet air systems, chillout, racetech seat back air ducting or really anything you need to cleanly duct air into. These also flow much better than a NACA duct.
