A new open-loop, low-speed wind tunnel has been designed and constructed at NTNU in order to determine the convective mass transfer coefficient. It has a working section 0.45 m wide, 0.3 m high and 1 m long with a maximum wind speed of 10ms-1 under typical operating conditions. The design was specially constructed by need to provide a uniform air flow without excessive turbulence and to verify its adequate influence of the simulated external boundary layer on the local convective mass transfer coefficient. This paper presents the results of mean velocity measurements in an empty tunnel using a Pitot-static tube, as well as measurements of mean and fluctuating velocities and flow characteristics using a hot-wire anemometer. The measurements of the mean velocity were found to compare well with simulations with the CFD tool Fluent.