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The Air Flow Studies Unit, "HECA", designed by EDIBON, is a floor standing unit that allows to measure different characteristics of air distribution systems and to demonstrate certain basic principles of fluid mechanics in ducts and jets. The unit is mounted on a metal frame with wheels and consists of two modules connected one to each other. One module includes an electrical centrifugal fan, with speed control. The other module includes a long and smooth test pipe that is connected to the suction side of the centrifugal fan. A deflector in the inlet prevents air separation from the wall of the pipe and reduce the formation of vortices, and the pipe diameter minimizes the presence of turbulence. Several pressure tappings are included along the length of the pipe to determine the pipe friction factor, pressure losses and velocity profiles. The air flow rate can be measured with various measuring devices, such as iris diaphragm, a Pitot tube, an orifice plate and two nozzles with different diameters. The unit includes two bends and an angle to fit to the pipe for comparison of pressure losses. The measuring devices and the Pitot tubes are connected via tubes to a multi-tube inc